Though I have P5 and it runs stable enough on my system, I find myself using Pro Pack all the time and NOT P5. Poser 5 is simply too sluggish. I know more Ram would probably help me, but so far I only use P5 when I NEED P5 specific effects. Personally I think I'd go for Pro pack and wait for DAZ|Studio, if I had the choise today. But again, Poser 5 does not crash or behave odd. It is just slower than Pro pack. On the other hand it has this new library system, so if you haven't got PBooost, P5 is almost worth the money just for that :o) Oh and I love the meterials room. Takes some time (for me a LOT of time) to really explore and get used to, but I love the things you can make there :o)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.