My brother and I have hoisted a few there in past years. Haven't been up for 4-5 years. I was able to take my '96 Impala SS on the big track on one visit, during a FIA prep race (6 hour race). Awesome track. I heard they are in financial trouble and the track is in jeopardy, that would be tragic.
I also love the Motor Racing Library just outside the Glen and could spend a week in there!