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 possible but requires excessive force. 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 MM311 are good to very good. There is some pre-travel, but post-travel is low on both buttons, resulting in a firm and fairly snappy button response. Despite being visually separated from the shell, button movement is minimal even when provoked. Button stiffness is medium, but the button design prevents the rear part of the button from being able to be actuated. A pair of Kailh GM 4.0 (60 M) switches are used here.


Side buttons are very good. The back button has some pre-travel, and actuation isn't entirely even, whereas pre-travel is low on the forward button, and post-travel low on either. Button size and placement are quite good, as actuation is possible rather easily by rolling one's thumb across. A set of Huano (green plunger) switches is used for these.

At the top of the mouse is a button for cycling through the set CPI levels, which feels just fine. Another Huano (green plunger) switch is used for this one.

Scroll Wheel

The scroll wheel is very good. Noise levels are appreciably low, and tactility is above average, providing decently separated steps and controlled scrolling. The encoder comes from Kailh (gray, black core) and has a height of 13 mm. The middle (scroll wheel) click requires medium to high force for actuation. Yet another elevated Huano switch (green plunger) is used here.

Surface

The MM311 has a matte surface all over. Grip is fine, and it doesn't attract fingerprints or dirt too much. It is 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 MM311 is reasonably easy. Two screws are found beneath the two rear skates, with an additional one found below the sticker at the rear. After their removal, wedging a credit card or something similar in between top and bottom shell is recommended to separate them easily, but make sure not to rip the ribbon cables connecting top and bottom.

The internal design is very efficient. The side buttons sit on their own PCB screwed into the top shell and connected through a ribbon cable to the main PCB. Three screws are used to affix the thin and compact main PCB to the bottom shell. The MCU is a Nordic nRF52810, whose datasheet can be found here. Despite the MCU supporting Bluetooth, this functionality remains unused on the MM311.


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