What do you get with P5 that you don't have already? The face room is useless and content parasite is worse than useless. The hair room takes a while to get used to and the results are not especially realistic - but it's worth experimenting. But I haven't experienced all the problems people claim are endemic in P5. It's rarely crashed for me and never since installing SR3. The material room and firefly take a steep learning curve if you're not already familiar with that sort of thing, but once you know how they work they're wonderful. The ability to nest folders is an absolute godsend, as is multiple runtimes. It's a quirky program. I don't like the way it handles some of my favourite hairs - the fix of applying a displacement works but I see a definite drop in quality when I do that. But in my opinion P5 is well worth the upgrade. Despite the quirks, I wouldn't go back to P4. And Daz Studio is just promises at the moment. I'll believe them when I see it working. Not before.