I'm going out to Buttonwillow again in a couple weeks, I've been road racing there and Willow Springs a handful of times and I love it, but haven't tried AutoX at all.
You think AutoX would be a let-down after the rush of a road course? I guess what sounds good to me is the fact that it hardly costs anything and would let me work on my driving -- which let's face it can surely use some help -- a little more regularly.