Had loads of them, g5's are nice, had 3 of them, buttons don't last very long.
Have a habu now.....not that impressed with it, buttons react slow in game.
Also have a very old mx500, best gaming mouse ever made for LOW sensitivity players, very rapid movements, never loses track unlike most modern mice.
Really like the look of the new QPAD ®|5K™ due out mid month, has been built for low sens users, can do 150 inches per second without tracking loss, thats 30G of accelaration wooooo.