The results were quite impressive:
- The upgrade from Vista 64 Ultimate bit towards Windows 7 Ultimate 64 bit went as smooth as it could no problem that I could find at all!
- An upgrade from Windows 7 RC was not possible, but a clean install did proceed smoothly
- All in all, the elapsed time was around 2 and 3 hours
Since the upgrade I have been working flawlessly, all applications upgraded without having to be re-installed or activated again.
In case you are wondering the upgrade path this article has great details about it:
Windows 7 Upgrade Path