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 X2 Mini are very good. Pre-travel is low and post-travel moderate, resulting in a firm and snappy button response. Compared to my copy of the X2, the left main button can only be moved slightly under the finger when pressed, and the right one not at all. Button stiffness is medium. A pair of Kailh GM 8.0 (80 M) switches are used.


Side buttons are very good. Pre-travel is low and post-travel nonexistent on the forward button, though the back button has some post-travel, resulting in a snappy and pleasing button response nonetheless. 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 (white plunger) is used for these.

At the bottom of the mouse is a single button for cycling through the set CPI levels, which works just fine. A seemingly unbranded tactile switch is used for this one. The slider at the bottom switches between on and off-state. While fairly stiff, this slider also works just fine.

Scroll Wheel

The scroll wheel is good to very good. Noise levels are elevated, but tactility is good, providing clearly separated steps and controlled scrolling. The encoder comes from TTC (yellow) and has a height of 10 mm. The middle (scroll wheel) click requires high force for actuation. Another Huano switch (yellow plunger) is used for this one.

Surface

The X2 Mini 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 X2 Mini is easy. The screws are located beneath the rear skate. The sides are additionally locked in with clips, which, for some reason, are much easier to dislodge than on the X2. As always, wedging a credit card or something similar in is the preferred course of action. When doing so, make sure not to rip the cable connecting the side-button and main PCB.

The design is reasonably efficient. Much like on the Xlite Wireless V2, the battery is located towards the rear. The side buttons sit on their own PCB screwed into the top shell, which also harbors the LED for the CPI level indicator and is connected to the main PCB through a ribbon cable. All PCBs are very thin to save as much weight as possible, but the main PCB is larger than it could be. Five screws in total are used to affix the main PCB to the bottom shell, which may be deemed excessive. Inexplicably, the PCB also has a "PMW3395" marking on it. The MCU is a CompX CX52850.


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