I was there last year. Definitely was a good event with hundreds of cool cars. Saturday there was crazy rain all day long and it made the fields a mess for Sunday. Had my car inside building Y as part of the IROC-Z display all weekend. Met a ton of cool people there too. It is a bit of a drive but I did not mind it at all. I don't think I can make it this year due to my work schedule though. Here is a link to the photos I took:
https://www.flickr.com/photos/123927...57655296065981
Definitely try to go if you can find the time