In regard to the models, most of them are still limited by defective Poser 4 JPs, so you still have to be careful of bending in such areas as shoulders, elbows, hips, knees, etc. In addition, many are reporting memory problems and frequent crashes/freezes, even though some have reasonably fast machines with 2 or more GB of RAM. However, the materials functions are vastly more sophisticated in P5/P6 than in P4. The latest version also has much better rendering capability, assuming you have a stable installation and plenty of time to learn the materials room.