I just got back a couple of weeks ago,and it was incredible.
Be ready to change some things, like your anchor, hold time, stance, and your way of thinking. He will also teach you how to set up your bow so that it shoots where you look.
I was blown away in the first two hours of the school, especially after he started tinkering with my rest and strike plate material. It was like sighting in a rifle, walking the shots towards the spot I was looking at. He also moved my fletching back a bit, so my nose would slide into the back of the feather, for a double anchor. After we got the bow set up correctly it was simply amazing.
I was very excited to say the least. I could have saved a lot of time and money if I would have done this 2 or 3 years ago. Money well spent!
You can check out my video from the last day on Rick's YouTube channel, Dakotaenterprises.
Be ready to take some notes, and ask lots of questions. It would also be a good idea to bring some bare shafts to get fletched up properly if you can.