Poser 5 version makes extensive use of the firefly rendering engine - the babies are textured with shader nodes and texture maps - for example -the sleeper outfit uses a displacement map to give it a realistic terrytowel texture even when viewed from the side. Also, the P5 version has the morphs sorted out into logical folders and sub folders - (see image)You will notice that I have the Expressions folder open and there are subfolders inside called xxx_Components. Inside those are the breakdowns of the expressions and subfolders for the asymmetrical components. Pro Pack version is similar to the Poser 4 version - textures and bump maps only except that they are all jpg instead of BUM files. Also, the previews are PNG files. The head morphs are all in a single folder which is not as tidy as the P5 version but that's the downside of P4. You could always make a lighter version with Morph Manager I suppose... There is no Dynamic sleeper included in the PP or P4 versions... for obvious reasons. Poser 4 version is the same as PP version except it uses RSR and BUM files as needed.