I went about 10 years ago and it was awesome. There are about 2 or 3 buildings full of every aftermarket chochkie you can imagine there. Celebrity interviews and anyone who's anyone in the TV car show business is there. Lot's of hotties also at the booths as well, but I'm married and didn't really notice any of that of course .
I'd like to go again just for fun and not work related so I can enjoy and take it all in. 1 day will only give you a glimpse.