Build Quality

Overall build quality is solid. When shaking the mouse, a minor rattle comes from the main buttons. 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 the debounce time is set to minimum.

Buttons

Main buttons on the HTX 4K are good to very good. There is some pre-travel, but post-travel is low on either button, and button response firm and snappy. While the buttons are visually separated from the shell, lateral button movement is fairly low even when provoked. Button stiffness is medium to light. A pair of Zippy DF3-P1L1 (60 M) switches are used.


Side buttons are very good. Pre-travel is low on both buttons, but the forward button has some post-travel, resulting in a snappy and pleasing button response nonetheless. The post-travel on the forward button improved after disassembly. 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 low-profile switches from TTC (blue plunger) is used for these.

At the top of the mouse is a single button for cycling through the set CPI steps, which feels fine. A switch from Huano (white plunger) is used for this one. Unlike on the Hati-S Plus 4K/ACE, the on/off-switch at the bottom can be easily accessed with one's fingers.

Scroll Wheel

The scroll wheel is very good. Due to the open bottom, noise levels are elevated, but tactility is great, providing very distinct steps and controlled scrolling. The encoder comes from TTC (gold) and has a height of 7 mm. The middle (scroll wheel) click requires medium force for actuation. A seemingly unbranded tactile switch (black plunger) is used here.

Surface

The HTX 4K 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 HTX 4K is very easy. All screws are exposed, so they only need to be removed. The sides are additionally locked in with clips, which are dislodged quite easily. When doing so, make sure not to rip the cable connecting the PCBs.

The internal design is very efficient. The CPI and side buttons sit on their own PCB screwed into the top shell and are connected through a ribbon cable to the main PCB. The battery sits on a foam pad glued to the bottom shell. Everything else sits on the main PCB, which has been extended at the sides to help with shell rigidity. All PCBs are very thin to save as much weight as possible. Four screws in total are used to affix the main PCB to the bottom shell. The MCU is a Nordic nRF52840, whose datasheet is found here. The Bluetooth capability of the chip remains unused. Production date for the side-button PCB is the 48th week of 2022.


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