Too be honest, I think when you take one these courses from CSIA or PSIA, you get a lot of out of them. You learn to work on technique on the flats, and some good drills.
The thing that I hate, is the ego's that can sometimes go along with this learning experience. I have heard that as you go up the levels, this ego and mentality can escalate. And, so does the price of these courses. I understand having a standardized measure for this levels and making sure you are qualified to teach but, when you are just starting out...the $400+ price tag starts you off in significant hole before you have even taught a lesson.