Training at Bondurant is not a goof-off, play-time joke. There is serious classroom time to learn serious theory, early starts, long days and thorough testing.
I have done other high performance / advanced driving courses before. But this was by far the most technical and demanding.
I did a 4 day course which I think cost about $5000 (someone else paid).
Based on what I can do in a car now, that feels like a bargain. The most valuable improvement in my driving is a much more heightened awareness of vehicle dynamics. I can "feel" the weight distribution of my vehicle change now as I change speed and direction. After driving the Bondurant vehicles, mine feels like a boat, but I can drive it a lot better. And if I ever have to do a reverse 180 at 40 miles an hour, no problem.
Also you meet really cool people in the course.