Build Quality

Overall build quality is very solid. There is no rattle when shaking the mouse. When applying lateral pressure, very minor creaking can be observed. It is impossible to activate the side buttons by squeezing the sides with any amount of force. Lastly, no accidental clicks occur when slamming the mouse down.

Buttons

Main buttons on the XM1 RGB are excellent. Much like on the XM1 and XM1 White, both pre and post-travel are very low, resulting in a firm and satisfying click response. The buttons no longer feel hollow, however, which massively improves click feel. As the buttons are separated from the shell, some degree of button movement is present, but the amount of wiggle room is as low as physically possible. Button stiffness is medium. Kailh GM 4.0 switches are used. These are pre-selected and come with an operating force of 60+-5gf instead of the usual 65±15gf; i.e., the regular GM 4.0 is substantially harder to press.


Side buttons are very good. The back button still has some notable post-travel, but pre-travel is uniformly low on either button. The actuation point is even across both side buttons. These buttons are slightly bulged instead of flat, which makes it easier to get a hold of them by feel. Button size and placement are good as actuation is possible rather easily by rolling one's thumb over these. TTC switches (red plunger) are used here.

At the bottom of the mouse is a single button for cycling through the set CPI levels and adjusting the polling rate. Its click feel is good. An unbranded tactile switch is used for this one.

Scroll Wheel

The scroll wheel is excellent. Neither scrolling up nor down produces any unwanted noise, and the individual steps are nicely separated, which results in great tactility. The encoder comes from Alps. The middle scroll wheel click requires low force for actuation. The switch for this one is new: a tactile switch from Panasonic. I have to admit that I found it very weird in use, however. I can't even say what makes it so weird, it just feels odd.

Coating

The matte coating of the XM1 RGB is very similar to the matte coatings of the newer XM1 revisions. It's very grippy and doesn't attract fingerprints, dirt or the likes too much. It's easy to clean, and there are no signs of wear left after doing so. All in all, an excellent coating.

Button Sound Test

Disassembly

Disassembling the XM1 RGB is very easy. Remove the two big feet and the screws beneath them and the top shell will come off with ease. The internal design is equally simple. Everything aside from the scroll wheel illumination on a small auxiliary PCB sits on a large PCB. The side buttons are mounted vertically onto the PCB. Four screws in total secure the PCB to the bottom shell, and the main PCB itself is moderately thick. The MCU is a STM32F072RBT6, whose datasheet can be found here. Production date for all PCBs is May 6, 2020.


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