Build Quality

Overall build quality is very solid. There is no rattle when shaking the mouse. 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 Hati-R 8K are good. Pre-travel is moderate to high, and post-travel is moderate, resulting in a fairly firm and snappy button response nonetheless. Being visually separated from the shell, button movement is moderate when provoked. Button stiffness is medium. A pair of Huano switches (blue transparent shell, pink plunger) are used.


Side buttons are very good to excellent. Both pre and post-travel are minimal, and by virtue of being very small, the actuation point is even across their entirety. As a result of their size, feedback isn't particularly satisfying, though this is unavoidable. Depending on grip, the side buttons may be considered to be sitting too far forward, and actuating by rolling one's thumb across may be difficult. A set of surface-mounted Omron switches (blue plunger) are used for these.

A slider at the bottom switches between on and off-state, which works fine.

Scroll Wheel

The scroll wheel is good to very good. Noise levels are elevated when scrolling up, but tactility is great, with clearly defined steps allowing for controlled scrolling. The encoder comes from TTC (blue, yellow core) and has a height of 8 mm. The middle (scroll wheel) click requires high force for actuation. A seemingly unbranded tactile switch (black plunger) is used for this one.

Surface

The Hati-R 8K 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 Hati-R 8K is trivial. The screws are readily exposed, and after dislodging the six clips arranged around the base, top and bottom shell are easily separated. When doing so, make sure not to rip the cable connecting the two.

The internal design is highly efficient. The side buttons sit on their own PCB screwed to the top shell and connected to the main PCB through a ribbon cable. The battery sits on a sticky pad residing on the main PCB, and the sensor has been rotated by 90° to make additional room. The very thin main PCB is affixed to the bottom with four screws, and has been extended such that it supports structural rigidity of the shell. The MCU is a Nordic nRF52840, whose datasheet can be found here. The Bluetooth capability of the chip remains unused.


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