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 when slamming down the mouse do not occur.

Buttons

Main buttons on the Keris II Ace are good. Pre-travel is low (left button) to moderate (right button), whereas post-travel is moderate. Button response is somewhat dull and muted, accompanied by a higher than average pitch. Despite being visually separated from the shell, button movement is low even when provoked. Button stiffness is medium. A pair of ROG Optical Micro Switches (100 M) are used.


Side buttons are good. While post-travel is nonexistent, pre-travel is moderate, resulting in a slightly mushy button response, along with somewhat unpleasant auditory feedback. The actuation 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 surface-mounted Kailh switches (green plunger) are used for these.

At the bottom of the mouse is a button for cycling through the set CPI levels, which works just fine, along with a button for device pairing. A seemingly unbranded tactile switch is used for both. A slider at the bottom switches between 2.4 GHz wireless, Bluetooth, and off-state, which also works fine.

Scroll Wheel

The scroll wheel is good. Noise levels are under control, but tactility is average at best, as the individual steps mostly lack definition. The encoder comes from TTC (yellow or "Gold") and has a height of 14 mm. The middle (scroll wheel) click requires medium to high force for actuation. A seemingly unbranded tactile switch (black plunger) is used for this one.

Surface

The Keris II Ace has a 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. That said, the riffle pattern at the grip area on the sides is prone to catching dirt, and cleaning it can be difficult. All in all, very good materials.

Button Sound Test

Disassembly

Disassembling the Keris II Ace is very easy. The screws are found beneath the rear skate. After removing those, top and bottom shell are readily separated.

The internal design is reasonably efficient. A plastic assembly is erected above the main PCB, holding the side-button PCB connected through an FFC as well as the battery. The FFC furthermore connects to an auxiliary PCB providing scroll wheel illumination. Five screws are used to secure the plastic assembly, and an additional three screws affix the thin and compact main PCB to the bottom. The MCU is a Nordic nRF52840, whose datasheet can be found here.


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