Dan Insanto was in my area bout 15 years ago doing an entire weekend series of clinics. I attended one on empty hand defense against a knife.
Literally every 3 minutes he changed techniques. Kinfe blades were flying from his hands left and right (one almost missing his new baby, and roused his wife a bit). There was no time to take notes. Fortunately I had his older book and generally understood what he was presenting, but if you had no background you could get lost real fast.
There was a group of his up from Princeton, and the classes were really an encyclopedic review for his students. Others got a chance to experience but IMVHO, not learn.
Learning requires a different approach.
A seminar with Insanto is definately an experience you should take, but to do more than just be exposed to his technique, you really have to work.
bushi no te isshinryu
offering free instruction for 30 years