So far the upgrade-in-place is working just fine. The reason I did it on this machine was so that I had some frame of reference back at work on monday. I haven't enabled time machine yet because I want to watch it/time it and we're off to a halloween thing tonight. But tomorrow I'll turn it on and report back.

For the record, the install went pretty fast, but the estimated times were always off. They must be running on Redmond time now... You know... 2 minutes = 5 minutes, 5 minutes = 10 minutes, etc. ;) That last 8 minutes was more like 15.