Unfortunately the same beta quality upgrade advisor has been there for several months even though Vista has RTM'd and plenty of us have both Enterprise and Ultimate in our hands. I had occasion to use the advisor the other day and it failed - said it had an unknown error on the application portion of the check (the only important part of the check for me actually). I tried a few times with the same problem. That said, it did work for my Wife's machine. Just not for mine. Anecdotal for sure, but it would have been nice to have the production version.