Build Quality

Overall build quality is solid. When shaking the mouse, a 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 occur regardless of the set debounce time.

Buttons

Main buttons on the VT9 Air are good (right button) to very good (left button). Whereas the left button has very low pre and moderate post-travel, the right one has moderate to high pre but low post-travel. Button response is fairly firm and snappy nonetheless. Despite being visually separated from the shell, button movement is low even when provoked. Button stiffness is light. A pair of Omron D2FC-F-K (60 M) (China) switches are used here.


Side buttons are very good (forward button) to decent (back button). The forward button has low pre and post-travel, along with even actuation, whereas the back button has moderate pre-travel along with uneven actuation, though post-travel likewise is low. Button size and placement are quite good, as actuation is possible rather easily by rolling one's thumb across. A set of surface-mounted switches from Kailh (green plunger) are used for these.

At the top of the mouse are two buttons for cycling up and down through the set CPI levels, which feel fine. Another set of surface-mounted switches from Kailh (green plunger) are used here. A simple on/off-slider is found at the bottom, which also works fine.

Scroll Wheel

The scroll wheel is good to decent. Noise levels are high, but tactility is above average, with steps decently well separated from each other. The encoder comes from Kailh (orange, GE 2.0) and has a height of 11 mm. The middle (scroll wheel) click requires medium force for actuation. A Kailh switch (black plunger) is used here.

Surface

The VT9 Air 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 VT9 Air is easy. First, all the skates and the screws beneath them need to be removed. In addition, two lateral clips need to be dislodged. The top and bottom shell can be separated now, but several sticky pads keeping everything together need to be taken care of, too.

The internal design is very efficient. The very thin and compact main PCB holds the sensor, MCU, scroll wheel encoder, and scroll wheel switch. On top of the sensor, the battery sits on a sticky pad, above which a secondary PCB connected through a ribbon cable is also stuck. This PCB holds the top button switches, and two PCBs holding a main button switch each and connected through a 2-pin connector as well as the side-button PCB connected through another ribbon cable branch off. The side-button PCB is screwed to a plastic assembly, which in turn is screwed to the top shell. The MCU is a Realtek RTL8762GKH, whose datasheet can be found here. Production date for all PCBs is the 23rd week of 2023.


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