I received my XT works great, but it is slightly slightly warped. On my desk all the feet don't touch at the same time. If I turn it upside down and look at the space between the desk and the top of the mouse pad I can see it warped. Its pushed down slightly in the middle. Since I don't notice it while gaming I won't bother to replace it.
I did the same test on my old giganta plastic mouse pad, and that is much more warped, I never even noticed it because all the feet lay flat, but the surface is just way warped. Maybe most of these mousepads are just made slightly warped or warp while hardening.
Wow, I got mine yesterday, fast shipping!
It seems great so far but a bit noisy sliding the mouse across the pad pretty fast, would some Teflon tape or scotch tape help that? Its just a Microsoft optical mouse and the original pads aren't worn down.