Amazing experience! Did the F430 race car Extreme package last week and it was totally worth it. It's a full 6 seconds quicker around the track than any of the other cars!
I was lucky enough to be instructed by a professional Ferrari GT race driver from Europe who had just flown in a few days earlier. He was really patient and got me to bring my time down consistently each lap. I was too conservative at first, driving it like a road car, but once we switched seats and he flogged it through a few demo laps (an awesome experience in itself), I could see how much the racing slicks and the wing really keep the car planted. It can pull something like 1.2 Gs, so if you drive it, don't be afraid to throw it hard into the corners (once the tires have warmed up of course).
This is a great experience for anyone who's interested in motorsports. Everyone there is really nice and helpful. Where else can you drive a race car for less than a thousand bucks?