Build Quality

Overall build quality is very solid. There is no rattle when shaking the mouse. When applying lateral pressure, no creaking or flexing of the shell can be observed. Activating the side buttons by squeezing the sides is impossible. Lastly, accidental clicks do not occur when slamming down the mouse, irrespective of what the debounce time is set to.

Buttons

Main buttons on the M8 Wireless are excellent. Both pre and post-travel are very low, resulting in a firm and snappy button response. While the buttons are visually separated from the shell, lateral button movement is minimal and needs to be provoked. Button stiffness is medium. A pair of Kailh GM 8.0 (80 M) switches is used.


Side buttons are very good. Both pre and post-travel are low on both buttons, resulting in a snappy and pleasing button response. The pressure point is even across the entirety of these. Button size and placement are good, as actuation is possible rather easily by rolling one's thumb across. A set of Huano switches (yellow plunger) is used for these.

At the bottom of the mouse is a single button for cycling through the currently active function. Its click feel is good. A seemingly unbranded tactile switch is used for this one. The slider at the bottom switches between off-state, CPI control, polling rate control, and debounce time control. While fairly stiff, this slider also works just fine.

Scroll Wheel

The scroll wheel is very good to excellent. Noise levels are mostly under control, and tactility is great, providing clearly separated steps and controlled scrolling. The encoder comes from F-Switch (brown, pink core) and has a height of 9 mm. The middle (scroll wheel) click requires high force for actuation. A seemingly unbranded tactile switch is used here.

Surface

The M8 Wireless has a smooth matte surface all over. Grip is fine, and it doesn't attract fingerprints or dirt too much. It is easy to clean, and there are no signs of wear left after doing so. All in all, excellent materials.

Button Sound Test

Disassembly

Disassembling the M8 Wireless is easy. First, the front and rear skates along with the screws underneath them need to be removed. The sides are additionally locked in with clips, which are dislodged quite easily. When doing so, make sure not to rip the cables connecting the PCBs.

The internal design is a bit different compared to earlier Xtrfy releases, but very efficient nonetheless. The main buttons and scroll wheel sit on their own PCB screwed into the top shell, which is connected to the main PCB through a ribbon cable. Likewise, the side buttons have their own PCB screwed into the top shell, which is connected through a 3-pin connector. Everything else sits on the main PCB, including the USB connector, which has been moved to the right side since the main PCB doesn't extend to the front. All PCBs are very thin to save as much weight as possible. Three screws in total are used to affix the main PCB to the bottom shell. The MCU is a CompX CX52850.


As for the soldering and general quality of the PCB, I'm unable to find any noteworthy flaws. The exception is a spot at the left front, which hasn't been milled properly.