I have a diamondback and a QPad XXXL
I have had quite a few mice and mats tho.
I had a Steelpad 4S which went shiney after using it for 6months with a MX-500, also the hardness wasn't very comfortable.
I wouldn't really recommend a hard mousemat since having problems with the steelpad and getting the QPad.
I also really like the diamondback in comparison to my previous MX-500 and Intellimouse Explorer v2/v3.