A real Master
Personally, I have been practicing Tai Chi and martial arts for over 15 years. I have learned from more teachers than most people ever meet. I can say without a doubt that Master Han is a special kind of teacher. Learning with Master Han for 5 years now has increased my Tai Chi skills by leaps, my teaching skills by bounds and my fitness level beyond what most hope to reach. If you can practice with Master Han for just 2 hours, do it!