Amapi (pre 6.0) is mostly about NURBS. In their own environment, they seem to make excellent organic models. And, efficent ones if the program doing the rendering uses NURBS in their native state. The problem comes in when these are converted to OBJ. There is a tendency for there to be extrordinary numbers of polys in locations with tight bends and curves. It takes skill to get an optimal poly density and keep as many of them as quads as possible. Quads flex and Poser can do as better job of smoothing them (I think). Many of the clothing items we see here that were built using NURBS are very nicely shaped but are just too large to be used in a complex scene.