Claw grip, right-handed gamer here. I'll start off by saying that I have owned MANY gaming mice over the years, starting with the old Razer copperhead and eventually this Steelseries Sensei [raw]. I am no stranger to gaming mice. I have either owned or tried nearly every mouse that's currently out on the market right now.
That being said, this mouse is probably the best that I have ever used. The aesthetics of the mouse are extremely similar to the microsoft intellimouse of olde. So if you grew up using one of those mice, this one will feel pretty much the exact same in your hand.
The tracking on this mouse is excellent, I have never had any issues whatsoever on any of my mouse pads (Razer Manticor, Steelseries 9HD, Mionix Propus 380, Razer Goliathus, and a couple others). This mouse performs excellently on any surface that I have put it on.
One big plus about this mouse is that, technically, you don't even really need to install any drivers or the steelseries engine software. The mouse will work perfectly if you simply plug-&-play.
The only thing that I would've improved, is that I would've liked to have been able to shut off the lighting in the steelseries logo found on the palm of the mouse. I would rather just have the mousewheel lit up.
Easily a 5-star product. If I ever break my mouse in a rage, I'll certainly buy another of these immediately.