Reviews of the most recent Vista interim build 5472 have been pretty positive. Computerworld has a good review here. I'm downloading it now as I write this post. I've been running a post-Beta2 internal build. These more recent builds are much more stable and performance is good enough for daily use. I've been using Vista and Office 2007 full time for the last 2 months. Despite being beta and the associated issues, I would not want to go back to XP/2003.