From what I've seen of the PPP, its benefits are pretty restrictive -- import/export to a few additional pieces of modelling software, some plug-ins, and some additional characters in the library. As primarily a Mac user, there wasn't anything in there of interest to me, so I gave it a pass. But I would imagine that many of the PPP functions will show up in Poser 5. And, as with every new version of any software, you can certainly bet that it will increase memory. I have yet to hear of a program that didn't.