Build Quality

Overall build quality is solid. When shaking the mouse, a minor rattle comes from the main buttons. 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 occur, but only if debounce time is set to 3 ms or under.

Buttons

Main buttons on the Z2 are very good. Pre and post-travel are moderate, resulting in a firm and snappy button response nonetheless. Despite being visually separated from the shell, button movement is low even when provoked. Button stiffness is medium. A pair of TTC Gold (60 M) switches are used.

Swapping the switches is done by unscrewing the three screws (PH 00) beneath the switch, unseating the switch, installing the new one, and screwing it back in. Accessing the switches requires disassembling the mouse.


Side buttons are good (back button) to excellent (forward button). Whereas the forward button has very low pre and post-travel, the back button suffers from moderate pre and moderate to high post-travel, and the actuation point isn't quite as even. Button size and placement are good, as actuation is possible rather easily by rolling one's thumb across. A set of Huano switches (white 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. A seemingly unbranded tactile switch is used for this one. 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 very good. Noise levels are rather high, but tactility is great, as the individual steps are very nicely defined, although possibly a bit too nicely, as scrolling can be quite stiff. The encoder comes from TTC (yellow or "Gold") and has a height of 13 mm. The middle (scroll wheel) click requires very high force for actuation. An elevated Huano switch (red plunger) is used for this one.

Surface

The Z2 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 Z2 is easy. The screws are found beneath the rear skate. After removing those, two additional clips at the sides need to be dislodged, which is easily done. When separating top and bottom shell, make sure not the rip the cable connecting the two.

The internal design is reasonably 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 is placed on a sticky pad towards the rear. Five screws are used to affix the thin yet arguably oversized main PCB to the bottom shell. 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.