In my opinion P7 renders faster than P6, the OpehGL-Preview is better and I have not found a critical Bug since SP1. If you don't use Vue (which at the moment seems to prefer P6 scenes) I would strongly suggest Poser 7. I have both here (both licensed, since I upgraded a free Poser 5 license to Poser 7 so I still have a valid Poser 6) and use just P7.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.