Build Quality

Overall build quality is very solid. When shaking the mouse, there is a slight rattle from an undetermined location. When applying lateral pressure, no creaking of the shell can be observed. Lastly, when slamming the mouse down, no accidental clicks can be observed.

Buttons

Main buttons on the A900 are excellent. Pre-travel is very low and post-travel is low, which results in a firm and satisfying click feel. Button stiffness is light. Chinese Omron D2FC-F-7N (20M) (OF) switches are used.


Side buttons are excellent. Pre-travel is virtually nonexistent and post-travel low. The pressure point is even across the entire button, and the click feel is satisfying. Button size and placement isn't quite optimal as these sit fairly high due to the RGB LED stripe being positioned right below, which makes it rather difficult to actuate these by rolling one's thumb over them. Kailh (red plunger) switches are used here.

At the top of the mouse is a single button for cycling through the set CPI levels. Its click feel is excellent as well. A YSA (red plunger) switch is used for this one. At the bottom of the mouse are two buttons for cycling polling rate levels and lighting effects.

Scroll Wheel

The scroll wheel is decent. It's fairly noisy when scrolling up and down, and the individual steps aren't as pronounced and tactile. Furthermore, I've noticed occasional instances of scroll steps being registered without the scroll wheel changing its position, which resulted in unintended weapon changes in games. The middle (scroll wheel) click requires moderate force for actuation. For the scroll click, another YSA (red plunger) switch is used.

Coating

The top part of the A900 is covered in a rubberized black coating, which is very pleasant to the touch. It's very grippy and doesn't attract fingerprints, dirt, or the likes too much. It's not that easy to clean, however, and even mild scrubbing will damage the coating. The sides are smooth plastic, which is much more resilient by comparison.

Button Sound Test

Disassembly

Disassembling the A900 is quite simple. Remove the bottom two feet, punch two holes into the area seen in the picture, and unscrew the four screws. The top shell should then come off easily. Some caution needs to be applied not to damage the ribbon cable, which connects the side-button PCB to the main PCB. While disassembling the A900 is easy, putting it back together is very difficult. For this reason, I strongly advise against opening it up.


As you can see from the pictures, a lot of thick and solid plastic has been used in the construction of the A900. Along with the PCBs being very thick and large, this is the main factor contributing to the higher than average weight. The design itself is fairly streamlined, with only one additional PCB holding the side and CPI buttons. The main PCB is affixed to the bottom shell with four screws, but their heads have been destroyed, making it impossible to get the PCB off unless destructive force is applied. The markings on the MCU read "WTU301 N360-C 1819-C." This MCU is a 32-bit ARM CPU, which has also been used on several other Abkoncore (Abko) mice as well as the Xtrfy M4.

As for the soldering and general quality of the PCB, I'm unable to find any noteworthy flaws. Right before the heatshrink is some cable lying bare, however.