Review on Razer Basilisk Ultimate Hyperspeed Wireless Gaming Mouse with Charging Dock: Fastest Gaming Mouse Switch - 20K DPI Optical Sensor - Chroma RGB - 11 Programmable Buttons - 100 Hour Battery - Classic Black by Nguyn Hong Qun  (Qun ᠌

The main and very critical minus for me is the build quality, namely: a strong backlash of the main buttons. If at the right button it is still not very significant, around 0.5mm, then at the left it is about 2mm and it's just horror! From this, all the comfort of using the mouse disappears, because. when you release your finger from the mouse after clicking, you hear a nasty loud crack of backlash buttons. If the mouse is simply lifted and shaken, then this crack is also heard. The answer of Razer 2022 in the FB group: backlash up to 2mm is acceptable. That is, they believe that for a mouse for 5k this is the norm and do not recognize this as a warranty case (although the backlash of the buttons is different, which by default suggests poor assembly or a design error!). Hangups: My particular instance has no problem with this. If you do not touch the mouse for some time, it goes to sleep, of course, but wakes up 1-2 seconds after you touch it. Battery: 40% spent in ~40 days. Five days 8 hours. Final verdict: The mouse is very good, but I'm seriously considering changing it to something else because of the play.