heya; actually, some people have experience p3 to be more stable than p4. the basic rundown is this: transparencies: you can use transparency maps and set materials to be transparent (of varying opacity). reflection maps: you can set a texture to be a reflection map, which can give you more realistic-looking metal and stuff. poser doesnt have settings to make materials 'reflective' or 'metallic' or 'plastic' or 'refractive' etc. use max. magnets: for quick and simple morphs right inside poser, these are cool, once you get the hang of them. they are best for moving and sizing things, and pretty good at rotating and twisting things. the wave deformer also ripples things. however, if you are looking to really sculpt things, these won't do it. new figures: actually, there isn't much difference between the p4 and p3 figures. the heads are the same (all the p3 morphs work on the p4 figure heads and vice versa). they come with more morphs for changing the shape of the head, for 'ethnicity' shapes of varying accurateness. there are also 4 new animals: wolf, lion, rattlesnake... was the angelfish p4 or p3? (geeze, even i'm starting to forget...) conformable things: the jury is still out on this one. posable clothing works just as well, or better in some instances. conformability allows you to dress up your poser 'doll' and have the clothes move with the figure as you pose it. sometimes it works nicely, sometimes... ::