Build Quality

Overall build quality is very solid. There is no rattle when shaking the mouse. 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 only occur if debounce time is set to 1 or 2 ms.

Buttons

Main buttons on the OGM Pro are very good. Pre-travel is low and post-travel moderate, resulting in a firm and snappy button response. Initially, the left click exhibited some crunchiness, but this went away quickly after some use. Despite being visually separated from the shell, button movement is minimal even when provoked. Button stiffness is medium. A pair of TTC Gold (80 M) switches are used.


Side buttons are excellent. Pre-travel is minimal, and post-travel low, resulting in a defined and pleasing button response. The pressure point is even across the entirety of these. Button size and placement are decent, as actuation is possible mostly easily by rolling one's thumb across. A set of Kailh switches (red plunger) is used for these.

At the top of the mouse is a button for cycling through the set CPI levels, which works just fine. Somewhat curiously, however, one has to quickly tap the CPI button twice instead of once to switch to the next step, as a single tap will only show a color corresponding to the current battery charge level. A Huano switch (green plunger) is used for this one. A slider at the bottom switches between 2.4 GHz, Bluetooth, and off-state, which also works fine.

Scroll Wheel

The scroll wheel is decent. Scrolling is fairly noisy, and tactility is largely absent, resulting in overly light scrolling. The encoder comes from TTC (yellow or "gold") and has a height of 13 mm. The middle (scroll wheel) click requires medium force for actuation. A switch from Yusya with an elevated red plunger is used here.

Surface

The OGM Pro has a matte surface all over. Grip is largely 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, very good materials.

Button Sound Test

Disassembly

Disassembling the OGM Pro is reasonably difficult. The biggest challenge is to get the mouse open in the first place. Four screws are located beneath the two large skates, with another one found beneath a sticker located under the dongle compartment door. Additionally, the sides are locked in with two additional clips, dislodging which can be difficult even if employing the trusty credit card method. When separating top and bottom shell, make sure not to rip any cables.

The internal design is simple yet creative. The top and side buttons sit on their own PCB screwed to the top shell and connected through a ribbon cable. Everything else sits on the compact and thin main PCB, which has the wheel encoder flipped, and the wheel click switch isn't straight to make room for a plastic pin holding the main PCB in place. The battery is seated vertically to the right of the PCB into a slot which is part of the bottom shell. Four screws are used to affix the main PCB to the bottom, with several pins providing additional stabilization. The MCU is a Nordic nRF52840, whose datasheet is found here.


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