I used a razer exact-mat - speed side for a few good years until I got my current mousepad which is the razer scarab - battlefield 3 themed edition. It's actually lying on top of the exactmat because I like the rigidity of it. Works just dandy with my RAT 7.
I have one of these- and I love it. I also have a smaller Rocketfish Best Buy-special that near exactly emulates it, and that was pretty cheap. I use the Razor pad with a Steelseries Sensei, and the smaller one with a G500, which travels with my mobile gaming workstation. Both work very, very well with the gaming mice.