I upgraded to 9 Pro when it came out, and haven’t used it since. I’m sticking with 8 until they fix the problem I have with external firewire preview. It does have some new features though, but that’s entirely up to you if they’re worth it or not.
On my home PC I’ve switched over to 64 bit Windows 7, so I’m hoping they get 9a out soon just because everyone here has said the 64 bit 9 is a lot better than the 64 bit 8.1