As a CS Major I have experience in a lot of OS's, I recently loaded up 64bit Professional 7 on my Desktop, and have run in to a couple issues that leave me wanting, but it's all from things that are completely understandable. I built my computer over 3 years ago for a 64 bit XP box that would be turned into a vista box. So I've ran into some issues with compatibility of NIC's and sound cards but that's all stuff that will be sorted out with drivers in time when they get around to it. Other than that I see that it has a lot of potential! It definitely runs smoothly and effeciently.