I would love to get in on a class like that and start improving my skills. The only problem is that my set-up is not DIR approved.
I would have to buy new hoses and the wet notes, spool with 70 to 100 feet of line, surface marker buoy or lift bag, and knife, plus the cost of the class. Seems like it will all add up to be quite a bit -- though all of my other gear seems to be appropriate. Eventually I'll probably take a course like that to improve my abilities. The skills taught in that class seem to be very valuable. Marc seems to be quite knowledgeable. I am sure it'll be a worthwhile experience.