I highly respect Clinton. I was at a tour stop a couple weekends ago (my second one-- first being 3 years ago), and he greeted EVERY person at the door, welcomed/ thanked them for coming, and shook their hand. I don't know of any "big name" trainer who would do that. It pretty much made my day! Haha
He is so down to earth, than a someone like Pat Parelli, who seems to only be in the business for the money most days. And like other people said, he is a "people trainer"; He's an outstanding teacher. (For example, after each demonstration at the clinic, he would quiz the audience over what they just saw and would give out "prizes" (dvds, halters, bridles, sponsors items, etc)-- while other clinics would just raffle out prizes and things.) He admitted during the tour that he's not a great horseman "naturally, but spent/ is spending years trying to get to where he is today and constantly credits his teachers about 99% of what he knows. He just presents the information in an easy way for people to understand.
I think that the biggest issue people have with the big natural horsemanship trainers, is that ALL of their personalities are extremely different. For example, Pat Parelli seems more of the "lets play with my horse" (and buy 10 more dvds...), while Clinton is more "lets get things accomplished and move on". These complete different mentalities definitely affect students will like or not like following them. For example, I have tried Parelli (up to Level 3), but grew bored with it and switched over to Clinton. The basic groundwork and ideas are all the same... but it's the way it's presented to the "student" that makes all of the difference.