Build Quality

Overall build quality is very solid. There is a very minor 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, no accidental clicks occur when slamming down the mouse.

Buttons

Main buttons on the Prime Mini Wireless are good to very good. Much like on the Prime Mini, the left button has significant pre-travel, albeit not quite as much, whereas the right one has similarly high post-travel. In terms of click feel, the left one again feels better, whereas the right one is dull and muted, almost reminiscent of a tactile switch. Despite being visually separated from the shell, lateral button movement is as low as physically possible and cannot be provoked either. Button stiffness is medium. SteelSeries-branded Prestige OM switches are used.


Side buttons are very good. Both pre and post-travel are virtually nonexistent, resulting in a very firm and snappy button response that is further complemented by the pressure point being perfectly even across the entirety of these. Unlike on the Prime Mini, these don't sound as hollow, though still less solid than the side buttons of the Prime Wireless. Button placement is good as actuation is possible quite easily by rolling one's thumb across. A set of Kailh switches (grayish case, orange plunger) is used.

At the bottom of the mouse is a single button for cycling through the set CPI steps and polling rates. How this works isn't immediately obvious. In order to cycle CPI, one has to press the button once to enter CPI mode, and only then is it possible to cycle through the set CPI steps with further button presses. Similarly, pressing and holding the button and then pressing again cycles through the available polling rates from highest to lowest. A seemingly unbranded tactile switch is used for this one. Below the CPI button is a simple on/off-switch that too works just fine.

Scroll Wheel

The scroll wheel is good to very good. Noise levels are the same as on the Prime Mini, but tactility is a bit better, providing highly controlled scrolling. The encoder comes from TTC (black core) and has a height of 12 mm. The middle (scroll wheel) click requires medium force for actuation. A seemingly unbranded tactile switch is used here.

Surface

The Prime Mini Wireless has a slightly rougher matte surface all over. Grip is fine, but it does pick up fingerprints, dirt, and the likes quite easily. It is easy to clean, and there are barely any signs of wear left after doing so. All in all, good materials.

Button Sound Test

Disassembly

Disassembling the Prime Mini Wireless is easy. The biggest hurdle consists of the four Torx T6 screws located beneath the three skates. With those taken care of, top and bottom shell are easily separated. Aside from the battery sitting atop a plastic assembly erected above the sensor, the design is very similar to the Prime Mini. While the main button switches are part of the top shell and insert into two contact points on the PCB, the side buttons sit on their own PCB vertically mounted atop the main PCB. An auxiliary PCB next to the scroll wheel provides wheel illumination and is connected through a 5-pin connector. Three screws in total are used to affix the fairly thin and compact main PCB to the bottom shell. The MCU is a Nordic nRF52833, whose datasheet can be found here. This MCU previously has seen use on the Aerox 3 Wireless. On that note, it is worth mentioning that the MCU would be capable of supporting Bluetooth, though this functionality remains unused on the Prime Mini Wireless.


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