bagginsbill - i was just about to mention that thread.  i will add that it shows that a) the map is good without the baked on highlights.  it's got some of the best variation and detail out there. b) his styles are good, solid classic styles.    most people try to make something with lots of strands and messiness and then give the strands a very banded repeating and obvious texture.   cool and all, but not very versatile.  you can use koz hair in almost any scene, where a lot of other artists go with more specific looks.  c) he has some of the best morphs in his hair you can find.  people rarely tax them, but even his early works have very changeable hair.   d) he pays attention to detail.  look at the part on that hair.it's not flat against the head like many, nor does it completely hide the scalp.  the edges of his transmaps are great too. 

just in general, koz makes great hair.  the baked highlights make it less realistic imho (same for 3Dream), but all i had to do was a quick search in these forums to find a way around that.