Build Quality

Overall build quality is solid. When shaking the mouse, there is a minor rattle seemingly coming from the side buttons. When applying lateral pressure, no creaking or flexing of the shell can be observed. Activating the side buttons by squeezing the sides is possible but requires excessive force. Lastly, accidental clicks when slamming down the mouse do not occur.

Buttons

Main buttons on the Clutch GM31 Lightweight Wireless are very good. Pre-travel is low, but post-travel is moderate, resulting in a firm and snappy button response. Unlike on the wired GM31, lateral button movement is less noticeable and needs to be provoked. Button stiffness is light. A pair of Omron D2FC-F-K (60 M) (China) switches are used here.


Side buttons are very good. Post-travel is minimal on either button, but pre-travel slightly higher on the back button, whose actuation point isn't even, either. Button response is pleasing all the same. Button size and placement are quite good, as actuation is possible rather easily by rolling one's thumb across. A set of Huano switches (blue plunger) is used for these.

At the bottom of the mouse is a button for cycling through the set CPI levels, which works just fine. A seemingly unbranded tactile switch is used for this one. In addition, a plain on/off-switch is found here, which too works fine.

Scroll Wheel

The scroll wheel is very good. Noise levels are kept to an absolute minimum, and tactility is above average, providing decently separated steps and controlled scrolling. The encoder comes from CF (black) and has a height of 12 mm. The middle (scroll wheel) click requires very high force for actuation. An elevated switch from Huano (green plunger) is used for this one.

Surface

The Clutch GM31 Lightweight Wireless has a smooth matte surface at the top and a textured pattern on the sides. Grip is fine, and neither surface attracts fingerprints or dirt too much. They are fairly easy to clean, and there are no signs of wear left after doing so. All in all, very good materials.

Button Sound Test

Disassembly

Disassembling the Clutch GM31 Lightweight Wireless is easy. First, all skates except the sensor ring need to be removed, along with the screws beneath them. Wedging a credit card between bottom and top may be necessary to separate them. Make sure not to rip the cables connecting the two when doing so.

The design is fairly straightforward. The side buttons sit on their own PCB slotted into the top shell and connected through a 3-pin connector with the main PCB. The side-button PCB is stabilized further by a plastic assembly screwed into the top shell, which holds the battery. The main PCB is needlessly large and moderately thick, yet only two screws at the rear are used to affix it to the bottom, with an additional screw for the USB connector PCB, which is placed beneath the main PCB and connected through a 4-pin connector. The MCU is a Nordic nRF52833, whose datasheet can be found here. The Bluetooth functionality of the chip remains unused. The production date of the main PCB is the 27th week of 2022.


As for the soldering and general quality of the PCB, I'm unable to find any noteworthy flaws.