No, I've not been able to get comfortable in one yet. I like the idea, though. Andrew (at Great Miami Outfitters) keeps trying to convert me. Of course, the last time I let him talk me into winter camping with him ("It'll be great, Glenn; temperature is supposed to be around twenty all weekend") it hit zero overnight...
Glad to hear they're adding another parking area; gives some better options for overnighters. TVT is growing on me, if for no other reason than I can decide at 3pm on Friday to go, and be on the trail by 5:30. (Quick drive from Centerville.) Not spectacular, but it's the woods and it's pleasant and it's outside.