I currently have the G9X, my first gaming mouse. And I absolutely love it!
I love the fact that it comes with 2 grips and enough weight combinations to keep you happy!
I love my G9X. I was looking into getting a Cyborg RAT 7 mouse, but I heard that there are a lot of mechanical problems with the mouse so I decided to get the tested and widely acclaimed G9X.
I would highly recommend it. I love that you can store all the profiles on the mouse for on the go gaming. This mouse's customizable buttons have helped me in my games like Combat Arms, FEAR games, Allods, amongst others!
If you can find a good deal on newegg or eBay, you can walk away with one at less than market price. I got mine for $50 bucks.
I have to admit, that I think part of the reason why I think its so good is because its gliding on an awesome Razer Goliathus Speed edition mousepad, which makes any mouse feel ohh soo good on it!
Get both I say, and enjoy a new mousing experience