Generally our upgrade went well, but we have some strange performance and functional issues with some workbooks. I will report them to Tableau when I find the time for it. We also lost our usage statistics and comments in the upgrade from version 7 to 8.
I recommend you to take a look at following threads:
2013-04-10 Upgrading Tableau Server 7 to 8
2013-04-03 can version 7 and 8 coexist?
2013-04-16 Problems or issues upgrading from v7 to v8? this thread
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I also wanted to let you know about our Upgrade Assistance Program. You can find more about it here: