Pros The tracking is very accurate. I have a Logitech G305 and I compared them two. The X2 mouse has aaaaaalmost as good tracking as the G305. (I just tried to get them to the same DPI setting and then tried to move the mouse pixel per pixel. The X2 did very well, but I think the G305 did just a tiny bit better (might be placebo effect)) As light as they advertise. 4. I found a piece of software in Reddit. It has no author. Don't know if I would recommend it to anyone, but it does enable the mouse to go to 1000hz polling rate, customize the key functions and control various RGB modes and stuff. Mid wheel feels nice Build quality when it comes to the plastic used is decent. I'm not worries about breaking or something. Cons The DPI change button feels cheaper than the rest, but I don't use it all that much. The main buttons are quite stiff. They need strong fingers to be pressed. I have a strong grip, but other might not. The power switch at the bottom is lose and you can hear it...
