Side buttons are generally seen as easy to reach and unusually good for a lightweight competitive mouse. Several reviews specifically praise their tactility or usability.
Side button quality is mixed. Some reviewers find the side buttons tactile and usable, while others call them traditional, mushy, or underdeveloped next to the new main clicks.
Side button quality is the most consistent weakness. Some reviewers liked the placement or in-game use, but many described the buttons as mushy, high, soft, squishy, or weak.