I don't use Koz's hair, even though it's great hair, judging from all the reviews. However, I really made up my mind to go all the way with Poser 5, and see very little reason not to do so. I find DAZ's continued resistance to Poser 5 to be one of the most "contrary" and unbusinesslike attitudes I've ever experienced. You'd think they'd finally get with the program. Hair makers should advertise whether their hair is designed to work with Poser 5's Firefly render engine. Does anyone have a list of just which hair is "Poser 5 ready?"