The story is that Mike can set up practice scenarios that are as close to the real thing as you will get. The guy will swim out into a rapid, and set a boulder on his legs, and all of the sudden you have a foot entrapment scenario. When you free him, he will float downstream face down until you get him. He will pin himself on bridge abutments, etc. Also, his teaching style is more about practical usage. He teaches you to have a bunch of techniques available for you to use, then common sense to apply them to the situation. There is no "correct" textbook way to do the rescue, rather he helps you lean to adapt to each situation.
Also, he's a super cool guy, great jokes, and you will totally learn a bunch, and have a blast doing it.