Build Quality

Overall build quality is solid. When shaking the mouse, a minor rattle comes from the scroll wheel. When applying lateral pressure, minor creaking but no flexing of the shell can be observed. Activating the side buttons by squeezing the sides is impossible. Lastly, accidental clicks when slamming down the mouse do not occur.

Buttons

Main buttons on the Model D 2 Pro 4K/8KHz Edition are good to very good. Both buttons have moderate pre but low post-travel, and button response is rather firm and snappy. Despite being visually separated from the shell, button movement is low even when provoked. Button stiffness is medium. A pair of optical switches from RAESHA (100 M) are used here.


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

At the top of the mouse is a button for cycling through the set CPI levels, which feels decent. Another Huano switch (green plunger) is used for this one. A simple on/off slider is found at the bottom, which works fine.

Scroll Wheel

The scroll wheel is very good. Noise levels are appreciably low, though tactility is merely slightly above average, as the steps are somewhat lacking in separation. The encoder comes from F-Switch (yellow, green core) and has a height of 13 mm. The middle (scroll wheel) click requires medium to high force for actuation. An elevated Huano switch (green plunger) is used here.

Surface

The Model D 2 Pro 4K/8KHz Edition has a 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 Model D 2 Pro 4K/8KHz Edition is very difficult. First, the two rear skates along with the screws underneath them need to be removed. Second, the rear top shell needs to be cautiously removed, giving access to the main button pieces, which need to be dislodged at the rear. Doing so allows one to access two downward facing screws towards the front, and after removing those, one also needs to dislodge the side clips, which can be difficult, along with two front clips.

The internal design is fairly efficient. The side buttons sit on their own PCB screwed into the top shell and connected through a 3-pin connector to the main PCB, while the battery is slotted vertically towards the rear. Everything else sits on the very thin main PCB, which has been affixed to the bottom with three screws. Two MCUs are used: A WCH CH32V307 RCT6, which provides a USB high-speed PHY and whose datasheet can be found here, along with a Nordic nRF52840 for wireless communication, whose datasheet is found here. The Bluetooth capability of the latter chip remains unused. The production date for all PCBs is the 26th week of 2023.


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