I use the Proteus Core are now one week and am very satisfied. At first I had while at the ergonomics of the mouse (you need to create complete his hand) used to, but then it just felt perfectly. The build quality is high and it is sweat resistant. There are just as many hot keys as you need. The Logitech driver is simply great. You can hire a professional anything. For example, you can enter a command to a key sequence of keys to be played after pressing the button. For example, in Bf4 if you look at times upset and just want to write "fagot" in the chat, you can already make provisions and this to a key :). Or Raget around so hard that you just want to just press ALT + F4. This goes well with just one button! : D The Proteus Core is a very Fre gamer mouse, with an unnecessary dpi (12000), but very good ergonomics and settings.