I've had variable success. Koz's early hairs such as the Nene hair work fairly well if you position them carefully enough. And I've had some luck with Confusius' Morphhair 2 and a couple of others. The trick is to experiment a bit. Sometimes you need to run a bead of vertices down either side of the hair part and make them choreographed (so they stick with the head in any animation). Also it's not necessary to drape hair from zero pose unless the pose has a head position that's really weird. Lately I've been using P5 hair on P4 models rather more than P4 hair on P5 models.....