Poser 4 was the first for me. I loved it so much that I upgraded to the Pro Pack version as soon as I could. The most exciting thing about Poser 5 (after about the last update when it would finally run well on my PC) was the folder structure. I remember in Poser 4 turning matpose files into Camera files or Face files just to fit in all the bounty I accumulated over the years. LOL What a nightmare it was to find stuff. :)