Using a Razer Diamondback for gaming currently. Good and fast mouse, but a little on the small side (but that's ok bcoz I have small hands). Basically you spend your hard-earned cash on a "gaming" mouse for the speed, adjustability, and STYLE factor. Now that I own a Razer, I must qualify that IMO Logitech gives the best balance in terms of comfort and performance, although less STYLISH than my Diamondback. I think the Logitech G5 and MX series are all SOLID mice.