Not to be negative... but
Considering the 2 weeks I've spent working on fixing the issues with the 8.2 upgrade, unless you REALLY need this upgrade for something that's critically broken, I'd wait for a while.
I've always had really good luck with plesk updates, with some help from 1&1, but this last one has really caused problems, and while there could be other issues at hand, (and I am on FC2 which may contribute) my poor little box is still having a hard time.
I have
** psa-dumps filling my /var directory
** no spamassassin, (although it's running)
** incorrect update reporting in the admin panel (not critical)
** unhappy customers
There were also database errors, and a few other issues that I was able to fix from the forums.
Again, I'm not sure it's all related, but it was all working before the upgrade and I didn't mess with anything else.
Just my 2¢