We do. We have a good sample of currently-used systems. Right now I'm on a Q6600 and an AMD 5850. We have 3 more Phenom II X4 940/GTX470 machines, and 2 more Q/E6600 machines with a GTX 270 and an AMD 4870.
We also have some intel software dev machines, with Sandy Bridge and Ivy Bridge CPUs. We are well covered for hardware, and we test everything we do on all of it. :IS2:
At home, I have an i7 920 and a GTX580. The game runs fantastic on Ultra. This just goes to show that the issues that remain, aren't simple ones to fix.