Average score
Product 1: GravaStar Mercury V75 Pro
4.1
Product 2: Epomaker G84 HE
4.3
acoustics
Product 1: GravaStar Mercury V75 Pro
4.2

Reviewers describe the sound as clacky and generally pleasing, with one noting it is louder and more direct while others call it clean or good sounding.

Product 2: Epomaker G84 HE
4.1

Reviewers repeatedly described the sound profile as subdued, cushioned, poppier, pleasing, or creamy/deep, but one review criticized heavy presses as resonant and hollow while another found it louder.

actuation consistency
Product 1: GravaStar Mercury V75 Pro
4.4

Actuation and switch behavior are consistently portrayed as precise and responsive, with stable performance, accurate registration, and rapid actuation/deactivation noted across multiple reviews.

Product 2: Epomaker G84 HE
4.4

Actuation was praised for swift reset, precise per-key movement, and dialed-in settings, though one reviewer with light switches reported accidental presses and typos from sensitivity.

analog input support
Product 1: GravaStar Mercury V75 Pro
No score yet
Product 2: Epomaker G84 HE
4.1

Analog-style support is only indirectly supported: reviewers noted adjustable actuation and linear-style controls that could matter in racing games, but did not deeply test analog behavior.

backlight brightness
Product 1: GravaStar Mercury V75 Pro
4.6

Brightness is strong where discussed, with reviewers calling the RGB bright and highlighting brightness controls in the web driver.

Product 2: Epomaker G84 HE
4.2

Backlighting was often described as bright, shine-through, or brighter than comparable boards, but one review said it looked uneven on larger keys.

battery life
Product 1: GravaStar Mercury V75 Pro
No score yet
Product 2: Epomaker G84 HE
4.6

Battery feedback was generally strong, including one claim of two months on one charge and another saying it was hard to drain, though RGB use reduced runtime in one review.

build quality
Product 1: GravaStar Mercury V75 Pro
4.6

Build quality is one of the keyboard's strongest areas, repeatedly described as sturdy, heavy, well-built, high quality, and aluminum-based.

Product 2: Epomaker G84 HE
4.2

Build quality was mostly positive, with reviewers calling it solid, heavy, sturdy, well-constructed, or not cheap despite plastic construction.

cable quality
Product 1: GravaStar Mercury V75 Pro
2.2

The included cable is a weak point in the one review that discusses it, because it is a plain rubber USB cable rather than a braided cable.

Product 2: Epomaker G84 HE
4.2

The only direct cable evidence mentions a braided USB-C cable, without deeper durability or flexibility testing.

compatibility
Product 1: GravaStar Mercury V75 Pro
4.0

Compatibility is generally positive for keycaps, Windows/Mac use, and select magnetic switch replacements, though switch compatibility still requires checking supported TTC and Gateron models.

Product 2: Epomaker G84 HE
4.2

Compatibility evidence covers Mac, Windows, PC, Android, and iPad-style use, though one review noted missing Mac-specific keycaps.

connectivity
Product 1: GravaStar Mercury V75 Pro
2.2

Connectivity is limited because the keyboard is wired-only; reviewers treat the wired setup as functional but restrictive.

Product 2: Epomaker G84 HE
4.6

Connectivity was a consistent strength, with repeated support for wired USB-C, Bluetooth, and 2.4GHz wireless, plus several reviewers praising quick switching or tri-mode flexibility.

customization options
Product 1: GravaStar Mercury V75 Pro
4.5

Customization is broad, especially around actuation, rapid trigger, lighting, remapping, profiles, and Hall effect features through the web-based driver.

Product 2: Epomaker G84 HE
4.5

Customization was a major theme, including actuation adjustment, software controls, macros, lighting settings, VIA/QMK-style remapping, and key assignment flexibility.

desk space efficiency
Product 1: GravaStar Mercury V75 Pro
4.1

The 75% layout saves space versus full-size boards by dropping the numpad and full navigation cluster while retaining arrows and useful keys.

Product 2: Epomaker G84 HE
4.7

One review specifically praised the 75% size for keeping the mouse from being pushed too far across the desk.

durability
Product 1: GravaStar Mercury V75 Pro
4.5

Durability evidence is positive, with reviewers pointing to heavy-duty construction, high-quality materials, and long switch lifespan claims.

Product 2: Epomaker G84 HE
4.0

Durability evidence is limited to one reviewer saying it could last for a year or five; no long-term stress testing was provided.

ease of switch replacement
Product 1: GravaStar Mercury V75 Pro
4.7

Switch replacement is easy where discussed, because the Hall effect switches are hot-swappable and do not require soldering.

Product 2: Epomaker G84 HE
4.6

Switch replacement evidence is positive but limited, with one reviewer saying switches can be popped out and replaced.

ergonomics
Product 1: GravaStar Mercury V75 Pro
4.1

Ergonomics are helped by adjustable feet or folding legs that change typing angle, though one reviewer found the feet visually unusual.

Product 2: Epomaker G84 HE
3.7

Ergonomics were mixed: reviewers liked the typing angle and height feet, but one reviewer found the angled position uncomfortable for their wrists.

extra gaming features
Product 1: GravaStar Mercury V75 Pro
4.6

Extra gaming features are a major strength, with rapid trigger, SOCD/LKP, DKS, mod-tap, profile switching, and advanced Hall effect functions cited.

Product 2: Epomaker G84 HE
4.5

Extra gaming features are supported by one review mentioning DKS and SOCD support alongside the Hall Effect feature set.

frame rigidity
Product 1: GravaStar Mercury V75 Pro
4.6

Frame rigidity is strong, with reviews emphasizing a heavy-duty aluminum or metal case, sturdy feel, and high-quality construction.

Product 2: Epomaker G84 HE
3.7

Frame rigidity was mixed: several reviewers reported flex or plastic construction, while one said the board stayed planted while typing.

gaming performance
Product 1: GravaStar Mercury V75 Pro
4.5

Gaming performance is consistently rated highly, with reviewers reporting smooth play, strong FPS performance, no obvious performance complaints, and fast response.

Product 2: Epomaker G84 HE
4.4

Gaming performance was broadly positive, with reviewers praising quick reactions, responsive feel, casual gaming comfort, and competitive-player benefits.

hot-swappable switches
Product 1: GravaStar Mercury V75 Pro
4.6

Hot-swap support is clearly present where reviewed, letting users swap compatible magnetic switches without soldering.

Product 2: Epomaker G84 HE
4.2

Hot-swap support is repeatedly mentioned, though one review cautioned that it applies to magnetic switches rather than traditional mechanical switches.

keycap quality
Product 1: GravaStar Mercury V75 Pro
4.0

Keycap quality is mixed: several reviews praise the PBT/PC materials and durability, while Tom's Guide strongly disliked the rough paint-like texture.

Product 2: Epomaker G84 HE
3.9

Keycap quality was mixed: reviewers noted double-shot or shine-through PBT, but one disliked the colorway.

key responsiveness
Product 1: GravaStar Mercury V75 Pro
4.5

Key responsiveness is a major strength, with reviewers describing instant key presses, feather-touch activation, ultra-fast response, and rapid registration.

Product 2: Epomaker G84 HE
4.5

Key responsiveness was a strength across reviews, with repeated references to swift input, instant response, snappy feel, nimble reaction, and precise input.

key spacing
Product 1: GravaStar Mercury V75 Pro
4.3

Key spacing and navigation are mostly positive, with reviewers finding arrows and extra keys easy to locate and useful in the 75% layout.

Product 2: Epomaker G84 HE
4.2

Key spacing and positioning were mostly praised, especially arrow-key separation and properly positioned keys, though compact layouts required some adjustment.

key stability
Product 1: GravaStar Mercury V75 Pro
4.6

Key stability is directly praised in one review, which notes stable switches with minimal wiggle or wobble.

Product 2: Epomaker G84 HE
4.0

Key stability evidence is limited to one review, which found no major wobble but said the switches were not the most stable.

latency
Product 1: GravaStar Mercury V75 Pro
4.4

Latency performance is strong across gaming-focused reviews, with several noting no lag, low latency, or very fast measured results.

Product 2: Epomaker G84 HE
4.4

Latency evidence was positive for wired and 2.4GHz use, while Bluetooth carried a higher stated latency or general wireless-latency caveat.

layout options
Product 1: GravaStar Mercury V75 Pro
4.1

Layout options are solid around the 75% form factor, variants, and configurations, though users wanting larger boards or numpads may still be limited.

Product 2: Epomaker G84 HE
4.5

Layout options were praised around the 75% or 80% arrangement, with reviewers noting compact functionality, writer-friendly sizing, and navigation/arrow keys.

legend visibility
Product 1: GravaStar Mercury V75 Pro
4.4

Legend visibility is positive where discussed, with one reviewer noting the large themed legends remain very legible.

Product 2: Epomaker G84 HE
4.1

Legend visibility was mixed: some found the legends clear or usable in the dark, while one review said the bottom-row typeface was hard to see.

macro customization
Product 1: GravaStar Mercury V75 Pro
3.2

Macro customization is mixed: one review says the web software can record macros, while another found no macro recording function at the time of testing.

Product 2: Epomaker G84 HE
4.3

Macro customization is supported through Epomaker software, macro settings, and key remapping through VIA-style programming.

materials quality
Product 1: GravaStar Mercury V75 Pro
4.5

Materials quality is high, with repeated references to aluminum alloy, metal, full aluminum case construction, and sturdy high-quality materials.

Product 2: Epomaker G84 HE
4.0

Materials were generally seen as acceptable for the price: plastic construction was noted, but reviewers still described the product as solid or quality-feeling.

media controls
Product 1: GravaStar Mercury V75 Pro
4.1

Media controls are present through a volume knob or lever, including mute behavior, though it is not always a traditional rolling knob.

Product 2: Epomaker G84 HE
2.5

Media-control evidence is limited and negative, with one review specifically noting that the keyboard has no knob.

noise level
Product 1: GravaStar Mercury V75 Pro
4.0

Noise level leans clacky and noticeable rather than silent, but reviewers generally describe the sound as acceptable or good rather than harsh.

Product 2: Epomaker G84 HE
4.1

Noise level was mostly described as quieter, subdued, or pleasing, though one review found heavy presses noisy.

onboard memory
Product 1: GravaStar Mercury V75 Pro
4.0

Onboard profile support is only lightly evidenced, with one review mentioning onboard presets and profiles.

Product 2: Epomaker G84 HE
No score yet
per-key lighting control
Product 1: GravaStar Mercury V75 Pro
4.6

Lighting control is strong, with per-key RGB, backlighting, side lighting, and lighting controls noted across reviews.

Product 2: Epomaker G84 HE
No score yet
polling rate
Product 1: GravaStar Mercury V75 Pro
4.4

Polling rate is a high-spec strength, with multiple reviews citing or testing 8,000Hz polling, though one reviewer considered it more marketing than noticeable.

Product 2: Epomaker G84 HE
4.9

Polling-rate evidence is strong but narrow, with reviewers citing 8000Hz polling and one saying they ran it at 8,000 hertz throughout testing.

portability
Product 1: GravaStar Mercury V75 Pro
2.6

Portability is a weakness because the board is heavy, wired-only, and visually or physically bulky despite its 75% layout.

Product 2: Epomaker G84 HE
4.3

Portability was generally positive thanks to compact size, light weight, easy relocation, and travel-friendly comments, though one reviewer found it somewhat hefty.

profile management
Product 1: GravaStar Mercury V75 Pro
3.9

Profile management is supported through presets and easy profile switching, though some layer behavior was described as limited or imperfect.

Product 2: Epomaker G84 HE
4.3

Profile-management evidence is limited to local configuration and the ability to connect up to five devices.

rapid trigger support
Product 1: GravaStar Mercury V75 Pro
4.7

Rapid trigger support is a core strength, appearing repeatedly with fine adjustment ranges and advanced Hall effect behavior.

Product 2: Epomaker G84 HE
4.7

Rapid trigger support is explicitly mentioned in reviews, including Snap Tap-style features and extensive rapid-trigger settings.

reliability
Product 1: GravaStar Mercury V75 Pro
4.2

Reliability is generally positive where discussed, with the keyboard feeling durable and a reviewer reporting no major issues, though minor double-clicking was noted as fixable.

Product 2: Epomaker G84 HE
4.0

Reliability evidence is limited to one reviewer expressing confidence that the keyboard could last for a year or five.

RGB customization
Product 1: GravaStar Mercury V75 Pro
4.5

RGB customization is extensive, with web software controls for lighting effects, colors, brightness, side lighting, and custom lighting behavior.

Product 2: Epomaker G84 HE
4.3

RGB customization is supported by full RGB/off modes, software control, effect cycling, and setup-matching lighting options.

RGB lighting quality
Product 1: GravaStar Mercury V75 Pro
4.6

RGB lighting quality is a standout feature, with praise for underglow, side lighting, bright effects, leg lighting, and the visual glow through translucent keycaps.

Product 2: Epomaker G84 HE
4.2

RGB quality was mostly positive for brightness, diffusion, ambience, and gaming pop, but one review criticized uneven larger-key backlighting.

size and form factor
Product 1: GravaStar Mercury V75 Pro
4.0

The 75% form factor is generally practical, balancing desk space and function keys, but some users may prefer smaller travel boards or larger layouts.

Product 2: Epomaker G84 HE
4.3

The 75%/80% form factor was repeatedly praised as compact yet functional, with enough keys for daily use while saving space compared with larger boards.

software quality
Product 1: GravaStar Mercury V75 Pro
4.2

Software quality is mostly positive because the web driver is easy and feature-rich, but some reviews mention early quirks, language issues, or missing macro support.

Product 2: Epomaker G84 HE
3.9

Software impressions were mixed: several reviewers found it extensive, serviceable, or functional, while others cited a learning curve, Chinese default, or awkwardness.

sound dampening
Product 1: GravaStar Mercury V75 Pro
4.4

Sound dampening is well supported by foam layers, dampening pads, and case design that reviewers connect to a cleaner clacky sound.

Product 2: Epomaker G84 HE
4.4

Sound dampening evidence was positive, with reviewers calling out dampened keys, spacebar foam, and internal foams shaping the sound.

stabilizer quality
Product 1: GravaStar Mercury V75 Pro
4.5

Stabilizers are positively described in the reviews that mention them, with reduced rattling/pinging and good stabilizer sound.

Product 2: Epomaker G84 HE
4.6

Stabilizer quality was positive where mentioned, with reviewers citing lubrication, no rattle, and prelubed plate-mounted stabilizers.

switch feel
Product 1: GravaStar Mercury V75 Pro
4.4

Switch feel is generally praised as light, smooth, stable, and pleasant, though switch choice is limited to linear Hall effect options.

Product 2: Epomaker G84 HE
4.5

Switch feel was usually positive, with reviewers describing smooth, satisfying, good-feeling switches, though one noted some scratchiness.

switch options
Product 1: GravaStar Mercury V75 Pro
2.6

Switch options are limited, especially for stock switch choice and for users who want tactile or clicky switches rather than linear magnetic switches.

Product 2: Epomaker G84 HE
4.4

Switch options include Transparent, Creamy Jade, and magnetic hot-swappable switch discussion, but the choices vary by model or color.

typing comfort
Product 1: GravaStar Mercury V75 Pro
4.2

Typing comfort is decent to good: reviewers liked the light switches and daily-use feel, though some disliked keycap texture or sensitivity settings.

Product 2: Epomaker G84 HE
4.5

Typing comfort was praised across reviews, including comfortable typing, long-session comfort, high accuracy, no discomfort, and properly positioned keys.

typing feel
Product 1: GravaStar Mercury V75 Pro
4.1

Typing feel is generally good or smooth, helped by light switches and sound tuning, but not every reviewer considered it great due to keycap texture or sensitivity.

Product 2: Epomaker G84 HE
4.5

Typing feel was one of the strongest areas, with reviewers describing creamy, premium, smooth, easy, satisfying, and improved typing experiences.

value for money
Product 1: GravaStar Mercury V75 Pro
3.6

Value for money is divisive: several reviewers find the premium build and design worth it, while Tom's Guide and another reviewer argue cheaper competitors offer better value.

Product 2: Epomaker G84 HE
4.5

Value was repeatedly praised, with reviewers citing strong features for the price, reasonable pricing, and no-brainer or worth-the-money language.

volume control
Product 1: GravaStar Mercury V75 Pro
4.1

Volume control is useful and repeatedly noted, using a knob or lever that can adjust volume and often mute.

Product 2: Epomaker G84 HE
4.0

Volume control is supported through remapping rather than a dedicated control, with one reviewer assigning keys to volume down and volume up.

wireless performance
Product 1: GravaStar Mercury V75 Pro
1.4

Wireless performance is a clear weakness because the keyboard has no Bluetooth or 2.4GHz wireless mode and is wired-only.

Product 2: Epomaker G84 HE
4.2

Wireless performance was mixed: one review called Bluetooth rock solid, while another warned that wireless can introduce latency.