I have this mouse now for over 15 months and am very happy with it. Quality default as the old Logitech mouse (MX518) (but Logi produced lately, unfortunately, only scrap (G7, G700, VX Nano, MX1100), more than one year has since long no longer held, or they were just bad thought) Unlike the mice that I bought in the past few years working here all the buttons. Switching between profiles is solved simple and ingenious. Here we see at least what sensitivity is set. The surface looks out but not used as described here. Precision is still very good. Apart from the mouse fits comfortably in your hand the keys are arranged well easily accessible and, in my opinion. All in all a very good choice to gamble and to work.
PS: Just one word about the quality problems. There seems to be really strong fluctuations. (Damn now are my track man on the mind, clearly is indeed already 12 months old: - (() I have the CM Trigger keyboard, there decreased after 3 months, the labels on some keys from white fields were only left after. Exchange (Amazon goodness !!) I got a new one, since 12 months, no problems and much better than the crappy G15.