He's giving a clinic in area and the cost is $500. IMHO (AND I may be wrong) lots of money as I do remember some clinics with the known dressage trainers and jumping trainers and those clinics were cheaper.
Since I can't judge (because of the lack of knowledge) I'm wondering is he indeed as good as the ad/website sounds?
P.S. They have (much much cheaper :) ) spots for auditors there...