I took the 4-day Grand Prix Road Racing course and, really, the best way to put phrase this is "You don't know what you don't know." I thought I knew what I was doing, but I really didn't. However, I didn't know that! They broke me down and built me back up with all of the correct methods. I can't say enough for the program and the instructors.
If you have questions as to how good they actually are, go to the corvette forums and ready the reviews that people have given them, from real Corvette owners and aficionados.
I WILL BE BACK!