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, unless debounce time is set to 1 or 2 ms within the software.

Buttons

Main buttons on the MM712 are very good. The left button has some pre-travel, but post-travel is low on either button, resulting in a firm and quite snappy button response, some dullness present on the left button notwithstanding. Despite being visually separated from the shell, lateral button movement is nonexistent. Button stiffness is medium, but the button design prevents the rear part of the button from being able to be actuated. A pair of LK Optical V2 (70 M) switches is used.


Side buttons are very good (forward button) to poor (back button). While the forward button has low pre and post-travel, the back button suffers from significant pre and ludicrous post-travel, the latter of which is pronounced to where the button can be pressed into the shell in its entirety. Likewise, the pressure point is even across the entirety of the forward, but not at all across the entirety of the back button. Button size and placement are good, as actuation is possible rather easily by rolling one's thumb across. A set of Huano switches (green 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 2.4 GHz wireless, Bluetooth, and off-state, which also works just fine. Lastly, an additional button can be used for pairing the mouse to a receiver. Another seemingly unbranded tactile switch is used for this one.

Scroll Wheel

The scroll wheel is very good. Noise levels are appreciably low, and tactility is quite good, resulting in fairly smooth yet controlled scrolling. The encoder comes from Kailh (black, cyan core) and has a height of 11 mm. The middle (scroll wheel) click requires medium force for actuation. An elevated Huano switch (green plunger) is used here.

Surface

The MM712 has a slightly rougher 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 MM712 is easy. The screws are located beneath the front and rear skates. The sides are additionally locked in with several clips. 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 efficient. The side buttons sit on their own PCB screwed into the top shell and connected to the main PCB through a 3-pin connector. The battery is placed atop hardened foam surrounding the sensor package. All PCBs are very thin. Only two screws at the back are used to affix the main PCB to the bottom shell, whereas the front isn't fixated at all, and unlike on the MM731, the top shell lacks a support column. The MCU is a Nordic nRF52833, whose datasheet can be found here.


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