I've been going the last few years. I drove over from Des Moines last weekend, it was pretty fun. Love the new Z06, and saw a red Evora amongst the supercars. Also saw a Bugatti Veyron for the first time, that was exciting. Not a bad show for $12.
Edit: Also the BMW i8 was awesome. Would love to have one. I thought it was just a concept car at first, then the guy told me they were taking orders for them, and I just started seeing commercials for them on TV. People asking questions about them at the show were pretty funny, asking how it could be so fast with just a 3cyl motor.