Have been and well worth the trip. Go onto Mustang Alley website and register. There probably is a Shelby group that is going who you coupd park with. Everyone should do this at least once.
I will do this someday. Many of the parts on my '66 are from Street Or Track - which is not far from Detroit. I'd like to get there to see the WDC and SorT.
I go every year...sometimes twice during the week in both of my cars. I will be there on Saturday near Berkely and also going to the Mustang Memories show on Sunday at Ford World HQ....awesome show!