I'd say it isn't more buggy than Poser 7. Probably less so. I'd gotten to know the old Poser 7 bugs and work around them, so then the new bugs tend to bother me more. I'm happy I upgraded.

The Poser Pro 2010 Beta, based on Poser 8, is in my opinion the least buggy first release of Power I have ever seen. And it's still a beta. In my opinion Smith Micro is really trying to improve Poser, which is more than could be said for the previous owner.