I have both pro and Poser5. The only thing I have ever used poser 5 for is exporting hair for my P4 stuff. To be honest, Poser 5 takes twice as many resoruces and runs half as fast as P4 does. While the files are a bit easier to browse I just find it much more cumbersome than the old PP. If you are interested in fancy renders Poser5 is not the way to go. Any main stream modeling package that can import .OBJ files will do a much better job in my opinion.