I've Just got mine and its AWESOME!!!

-excellent mouse
-incredible precision
-adjustable weight cartridge
-fits nicely in your hand
-large pads on the bottom of the mouse for easy movement

I find it great for gaming with on the fly dpi changing up to 5 setting with the software installed.
Scroll wheel is a bit rigid and I found that with the software for the mouse installed the game I was playing did not pick up the side thumb button, but all in all a very good buy a definite must have for a serious gamer.

For any gamers out there looking for a TOP-GAMING mouse, here you have it!
Incredible sensitivity, nice hand grip, weight adjusting.. The only real problem, is that its only for right handing gamers. :)