High performance driving school opinions?

Anyone have any experience or know someone who took a high performance driving class? There's Bob Bondurant and Skip Barber but what about the others out there? They are not cheap so am curious to hear opinions.
Did the Derrick Daley School twice when he had it in Las Vegas. He had the Formula Fords . Was racing a Trans Am Car in vintage events at the time. Learned an incredible amount and realized I had a bunch of bad habits . Only problem was after driving the open wheel cars driving the Mustang was like dancing with a fat lady. Ended up with this. Do one for sure.

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