I've been running 7 X64 since the beginning of September, and I've had no problems either. It's been fantastic all the time, except for one little thing-some games (Especially Company of Heroes), when I run them with a movie or something going on my second monitor, will give a 'Your system is running slow, downgrade the visual themes?' popup, despite the fact that no, it's not running slow (CPU usage at about 50%). And I can't make it go away, despite clicking the 'go away forever' option.