I have thrilled the G600 since 7 months now in use and am since day 1. The mouse glides quite outstanding (in combination with a Logitech G240 Gaming Mouse Pad Cloth). I was so far no Hooker, stuttering or Verspringer notice as was the case with many other products. The mouse is beyond excellent in my hand, but here everyone must of course make yourself his experiences.
I play mostly games by Blizzard, so WoW, Hearthstone and recently Heroes of the Storm, beyond even Marvel Heroes. Unfortunately I can not comment to say how this Mouse hires in shooters. But for my needs it is the best piece of technology.
About the outstanding software to any additional keys can be freely configured. A blessing is the third mouse button, which is operated with the ring finger for me. This opened me for Games wonderful assignment options (Shift or Alt - is key here).
Even after seven months, intensive use can be far not detect any signs of wear. My conclusion therefore is: I am very satisfied and would buy this mouse at any time!