I used GV 0.8 and 0.9 for a while and found it to be a highly satisfactory ROM. The only reason I moved back to DeFroST 6.1 is that I use the the phone's GPS through CoPilot and Endomondo a lot and neither piece of software (yet) supports Gingerbread so I was getting wonky performance. I may give it a little bit more time and try again, although I suspect if HTC don't get round to rolling 2.3 out onto the Desire CoPilot at least will never work. (I've already had a long "discussion" with CoPilot Tech support on this issue but they seem immovable on the subject).
To be honest, if it wasn't for that, I'd be using GV even now.