I've got PP and P5, and I use both, and see the merits of both. I don't have Lightwave, or Max, or any of those high-end programs. Other than Vue, Poser's all I've got, so the Cloth Room and the Hair Room are great for me, slow and buggy as they are. (The Face Room's pretty useless, and I recommend getting rid of Content Paradise. P5 will run better for it.) I also love the P5 library setup. Not just the multiple runtimes, but the whole way the library's setup. Having to go back to navigating the P4 setup is a PITA for me. OTOH, PP is a lot more stable. I've got a Pentium 2.8 GHz with 1.5 Gb RAM - a fairly new machine - and P5 still chokes on large renders. It's also much slower than PP. So I still use PP when I want something quick & dirty, or when I'm rendering a very large scene.