You definitely want to keep your P4 installation, for several reasons. First being to keep Vue happy and accepting PZ3 files; it doesn't recognize the P5 executable. The next being that P5 allows you to link to runtimes external to that program, so you can link to your P4 library without having to reinstall -all- that content. Another trick to keep in mind is that this will allow you to create custom runtimes, such as one for all DAZ products, one for Rosity products, and so on. The new goodies are the dynamic hair, cloth, and material room. When you use those, the scene file gets appended with a .PZZ, which Vue doesn't accept. The hair is particle based, and it doesn't export to -anywhere- just yet. The dynamic cloth can be used, but only as a static object (posing your figure, getting the cloth exactly as you want it, saving the scene, turning -all- but the cloth invisible, exporting the deformed cloth as an .obj, then importing it either back into the scene and replacing the dynamic cloth or into Vue as a seperate prop). In the material room, if you go beyond simple mapping, you won't get a recognizable texture export. However. Like C!rcle said, the characters and static props are P4 compatible, and do export.