Do NOT buy this. I've got a RAT9 myself too, and I'm regretting having bought it EVERY SINGLE DAY that I'm using it. The dpi switch only affects software, not the hardware, so it'll still move around if you decide to breathe near it. The software's standard saitek buggy stuff, so if you do use the programmable buttons, you risk bluescreening. And if the sensor's anything like the RAT9 one, you'll be unable to use the mouse while having loudspeakers in the same room. Oh and pressing the left mouse button makes teh mouse move, so you'll always miss your shot, and the 'aim' button is too far in front and can't be reached comfortably, making it useless. Oh and did I mention that the buttons on the left side above the thumbrest are 'contact triggers' and not buttons you can keep holding down? so no push to talk on the mouse.
Also the thumb rest can't be fastened properly, and the battery is sometimes stuck, making quick battery exchanges near impossible.
This new thing looks very much like the same design, so stay away from it. Really.
Get anything else. Anything at all, and you'll be better off.