It is flawless. I am running 2 Ultra ATA 100'2 on a RAID 0 stripe and have had no problems. Be sure to run the two drives as masters on thier own controller, running as master and slave will slow access time.
I do have a problem that I'd like you to look out for, sometimes the system will not restart properly and I am not sure if it is a MB issue or a Vid issue. Every so often when I power the system up it hangs before the vid post comes up. All it requires is a cold boot, but it is sort of a pain. Let me know if you have the same problem.