Very cool guy. I am reading his book right now, What Horses Reveal. Basically sorts out horses in character groups and explains in depth of what they're like, what rider suits them best and how you would go about training that particular group. Very fun. :)
I have the Dancing with Horses video. I love his work. I don't consider him NH along the lines as Parelli or some of the others. I really like Hempfling. He's got a very good style and it's easy to learn. I haven't gotten his DVD's yet but that's on my list as I'd like to see how it's done on video rather than just reading about it.