To me, it's worth it for the hair, which is great, and for the materials (also great). You do need a pretty powerful machine to run it well, I think. It runs well on my machine, but doesn't on others, although it seems like it's getting more compatible all the time - there's really few complaints in the beta forum anymore. The renders also turn out better (most of the time!), so that little to no postwork is needed. You can't export the hair or materials into Bryce or other apps at the moment. Really, it's up to you - you will have to spend some extra time getting everything right to render in Poser, most of the new features won't export out.