I upgraded from build 3188 to 3.0 and had no issues. Snapshot/undo support, the primary reason I upgraded, works great. Additionally I was pleased to see a bug in Coherence was fixed, sound no longer uses a ton of CPU, and I was able to run a DOS program which formerly crashed Parallels hard. I decided to register and post to provide a little counterbalance to the hyperbolic accusations on this board that Parallels "does not work at all" and that the company is a bunch of "crooks" and "con-men". I've used Parallels for several months, and though I've encountered a few bugs, the Parallels team is good about addressing them. I was also quite surprised that Coherence was added as a free feature in the 2.x timeframe--that was worth paying for in and of itself. I hope the Parallels team, read this thread and see there are satisfied customers out there, not just vitriol.