I actually went out to his shop a couple of times. He seems like a straight shooter and I find his prices are generally really good. As Mike says, he is much more responsive to phone calls than emails.
I was looking specifically at an early C3 that needed a little work to make it roadworthy. He offered to let me use his garage and lift and even offered to give me a hand to get it up and running.
He has a ton of vettes and I think he is a real enthusiast. He does some business on ebay too, so check out his feedback. The only thing I would worry about is that his ID has changed quite a few times. Here is his feedback page...
http://feedback.ebay.com/ebaymotors/...143720&frm=284