Yes, I'm returning it. The SATA speed under Windows XP is horrible. I'm not sure if they will ever find a way to fix it. Yes, they probably will... but I can't take that risk. Oh, but I bought a mac... why do I care about Windows XP you ask? Well, I bought a $2500 machine hoping it could replace my PC's also. I NEED to have Windows PC's. It's just a fact. I need it for my work, I need it for games, I will always need a PC more than I 'need' a mac. I have a Kodak i160 scanner that seems to have absolutely no Apple support. It's a firewire device, so even Parallels (when they fix it to run on a Mac Pro) will not work, they only seem to deal with using USB devices inside virtual machines. I love using OSX and I love Macs but unfortunately the Mac Pro, at this time, isn't fitting my need. Some other observations.. I had my 7800 GTX in there so I could play games in Windows XP. While that worked great, the card got REALLY hot. I mean REALLY hot. It's probably because Apple doesn't expect people to use their systems this way. The faster video cards they sell are double wide with the fans on the cards routing air directly out of the case. The 7800 GTX doesn't have this. Had problems installing non-windows OS's (Linux specifically). Probably related to EFI/CSM. Not sure I'll ever need a non-windows/Apple OS on the machine, but I want to have that available for me in the future. And in the future, maybe Apple will make the Mac Pro more compatible. For now, and I should have known, it's not. All in all, if you just want to run OSX on a Mac Pro, it works great... right now. If you want Windows... it will work, but poorly. If you want another OS, well... either hope the OS decides to support the Mac Pro or hope Apple makes the Mac Pro more compatible and friendly to other OS's. The Mac Pro is a wonderful Apple Macintosh product, but it's not a great all around PC. Yes someday maybe this Mac Pro will "do windows too", as the Apple slogan states and they are marketing so strongly, but that day is not today. So for all of you who want to use the Mac Pro as your primary desktop to run OSX and Windows, primary machine to do everything on, the Mac Pro it is not the answer right now.