There are a few very minor upgrade details I am looking into and working with Urchin on which I expect to have under wraps today, and from tonight on forward we should be doing a more detailed and intensive processing of stats information.
Currently the issues at hand have to do with the DNS resolution and scheduling for DNS lookup client updates, all stats information, usernames and password have migrated successfully (as best as I can see), and we should be in good shape. Once I have the upgrade 100% finalized (basically after I once through my few points of concern with Urchin), we will see if more detailed reporting can be enabled and move forward from there.
As for the little bumps with the upgrade, I do apologize...I personally wanted to wait until 5.1, but it seemed demand was high and for the most part v5.0 seems to be ok for the most part.....so we will see.