I went to the 2-day M School back in January. Best experience I have had and highly recommend it. We started off with M5s the moved to z4m's then the M6s on the first day. Then on the second it was more of what car do YOU want to drive. I have also done the 2-day regular school like one of the other posts, if you have the opportunity to do the M version, take it, it's a once in a lifetime experience.

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2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options