Poser 6 is a good upgrade for the artistically inept. In all the time I owned P4 and the few months I owned P5 before upgrading I could never get my figures to not look cartoonish even with global lighting. With P6 a basic IBL setup produces realistic renders. Plus I find the workflow/options much more intuitive. I've had few problems with bugs and no crashes at all. Overall, a worthwhile upgrade.