ANC performance ranges from average to solid-for-the-price: it reduces low-frequency rumble well but is not class-leading versus premium models. Noise control is adjustable in the app with ANC on/off and hear-through options, making it easy to tailor for different environments.
Android support is strong thanks to features like Google Fast Pair and aptX/aptX Adaptive compatibility.
The app is useful for firmware, library management, and Playlist+ tasks, but it is basic rather than feature rich and can feel awkward compared with more polished headphone apps.
The Connect app is feature-rich (EQ, noise modes, codec selection, updates, extras like soundscapes and ear-profile tools) and is generally reported as stable.
aptX/aptX Adaptive support makes these particularly attractive for Android users seeking higher-quality Bluetooth audio.
Low-latency mode delivers good audio-video sync, with most reviewers reporting minimal lip-sync delay for video and casual gaming.
Bass is inconsistent. Some reviewers hear solid or even punchier bass, especially underwater or with earplugs, but others call it hollow, woolly, or nearly absent on land.
Bass is the headline: deep extension and punch are repeatedly praised, though it can sound forward on bass-heavy mixes.
Battery life is solid for the category, with most reviews landing around the claimed 9 hours over Bluetooth and 6 hours from memory mode, though some testing suggests real-world endurance can fall short of the marketing numbers.
Battery life is repeatedly described as best-in-class, commonly around 20 hours in the buds (about 15 with ANC) plus roughly 30 more from the case.
Bluetooth is fine for some above-water use, but stability is not flawless. Multiple reviewers mention stutters, disconnects, or pairing friction, and underwater Bluetooth remains impractical as expected.
Bluetooth stability is typically strong (including longer-range anecdotes), but a few users report occasional dropouts, especially in multipoint or obstructed scenarios.
Build quality comes across as sturdy, flexible, and ready for abuse in the pool or during training. The sealed construction and soft exterior inspire confidence.
Build quality is widely seen as robust for the price, though a few note the silicone tips feel thin and may wear over time.
The controls are the most common complaint. Physical buttons offer tactile feedback, but many reviewers found them too small, too close together, slow on secondary presses, or easy to trigger incorrectly while moving.
Physical buttons help avoid accidental touches, but their placement and size can be fiddly; some find multi-tap actions or locating the buttons frustrating.
The magnetic proprietary cable supports the waterproof design, but it adds one more special accessory to keep track of, and one reviewer reported unreliable wired file transfers.
The included cases are generally well regarded. Reviewers call them protective and practical, though some found the standard case bulkier than necessary.
The case is generally sturdy with clear battery indicators and secure retention, but its large footprint is a common complaint.
Charging is straightforward once aligned with the magnetic connector, and case-based charging options add convenience, but the waterproof-focused approach means living with a proprietary setup.
Charging is USB-C with strong fast-charge results (about 10 minutes for roughly 90 minutes playback); most reviews note no wireless charging on the CKS50TW.
Codec support is a strength, with SBC/AAC plus aptX and aptX Adaptive mentioned often, and some app control over codec selection.
Comfort is one of the strongest recurring positives. The open-ear design avoids ear-canal fatigue, vibrations are generally well controlled for the category, and several reviewers found them easy to wear for long swims or runs.
Comfort is generally good once the right tips are found, but the larger housings can feel bulky or less secure for smaller ears.
The design is sporty and practical rather than stylish. Reviewers like the soft-touch finish and purpose-built form, even if it looks more specialized than everyday headphones.
Design is functional but plain, and the size is frequently called bulky compared to sleeker rivals.
Multiple ear tip sizes are included (often four), helping with fit and seal, even if durability concerns pop up in a few reviews.
EQ tuning is essentially missing, so you are mostly stuck with the default sound signature.
EQ customization is a highlight, offering a five-band EQ and useful adjustments to tailor bass/vocals and overall balance.
The app includes a locate/find function for the earbuds, which is useful if you misplace them.
Tuning trends warm rather than strictly neutral, but multiple reviews call it well-balanced across the range with good overall coherence.
Accessories are a plus. Earplugs and a protective case show up repeatedly as useful inclusions, and they materially improve the swim experience.
Separation and imaging are strong for the class, keeping transient details in context, but it does not match higher-end audiophile flagships.
Pushing volume too high hurts sound quality. At max levels, reviewers noted distortion, harsher vibrations, and less pleasant listening.
At very loud listening levels, some note dynamics can feel slightly compressed or squashed, even if clarity remains decent.
Noise reduction on calls is inconsistent, with wind and busy-street noise sometimes bleeding through and degrading intelligibility.
Call quality is usable but not a strength. Voices tend to sound quiet, distant, or light on detail, which fits the swim-first design but limits all-purpose appeal.
Call quality is mostly clear in quiet settings, with mixed results outdoors or in noisy rooms; some experiences are excellent while others report average performance.
Mids and vocals are serviceable rather than standout. They come through well enough for workouts and can sound more balanced underwater, but several reviews say voices lose body or detail above water.
Midrange is generally clear, but the stock tuning can let bass mask lower mids and push vocals back; the Clear Vocal/EQ options help restore presence.
Multipoint support is absent, which limits convenience if you switch between devices often.
Multipoint is widely appreciated for switching between phone and computer, though there can be slight delays and occasional reliability quirks.
The open-ear design provides almost no passive isolation on its own. The included earplugs make a noticeable difference in the pool by reducing splash noise and improving perceived clarity and bass.
The seal provides solid passive isolation, sometimes good enough to reduce noise even before ANC is enabled.
The local-memory feature is the reason to buy these. Reviewers like the 8GB storage, drag-and-drop loading, and true phone-free swimming, but Playlist+ is often described as clunky, slow, or awkward, and 8GB trails some rivals.
Portability is the main physical downside: the case is chunky and the buds are large, so jeans-pocket carry can be awkward even if bags and jacket pockets are fine.
Preset EQ modes (such as Bass Boost and Clear Vocal) are frequently cited as helpful and can meaningfully change the listening profile.
Wear-detection sensors are a notable omission in multiple reviews, so playback does not auto-pause when you remove a bud.
Sidetone/side-talk features help you hear your own voice more naturally during calls, which several reviewers appreciate.
Sound quality is the main compromise. Underwater playback is often described as good or at least satisfying for the category, while above-water listening ranges from merely okay to clearly weak compared with better open-ear or in-ear alternatives.
Across reviews, sound is described as warm and engaging with strong detail for the price, especially after EQ tweaks; a minority find it merely average without tuning.
Soundstage is often called convincing and well-staged for true wireless, though a few impressions place it closer to average rather than expansive.
Spatial audio/360 Reality Audio is a mixed bag: some find it immersive, others dismiss it, and it is limited by supported services.
Once the fit suits your head, stability is excellent. Reviewers regularly say the headset stays put through swimming, running, and vigorous movement, though smaller heads can end up with extra rear loop.
Stability is generally strong once fitted, with multiple workout and head-movement anecdotes indicating the buds stay put.
Hear-through/transparency is generally usable and fairly natural, but it can be mild and is not on the level of the best implementations.
Treble is acceptable for exercise use, not refined listening. Highs are often described as rolled off, grainy, or slightly distorted when volume climbs.
Treble is usually smooth and non-fatiguing; some reviewers want more sparkle or sharpness, while others note it stays crisp at higher volumes.
USB-C charging is consistently included and straightforward.
Voice assistant support is limited in some coverage, with at least one review noting a lack of built-in voice-assistant control compared with certain rivals.
There is enough output for workouts and spoken-word listening, but open-ear use in noisy settings often requires higher volume than ideal.
Water performance is the standout strength. The IPX8 rating and real underwater playback are consistently praised, making these far more convincing for swimmers than most open-ear alternatives.
Water resistance is consistently positioned as workout-friendly (commonly IPX4, with some coverage citing higher ratings on newer variants).
These are repeatedly described as lightweight and unobtrusive, which helps during long sessions and makes the headset easy to forget once positioned.
Weight is noticeable for some (and a few describe the fit as unbalanced), but others find the buds comfortable for long sessions.