He ships fast and seems to be honest. If it's a conversion rather than an original AES, he will say so in the Ebay posting, so just read them carefully. As with most stores, you should contact him shortly after making your purchase though to make sure he ships right away. I got a joystick from him the same week I purchased it, but I had to contact him to hear what was going on with my purchase.
His prices are unusually high across the board. But if you are willing to pay between scores of dollars to a hundred bucks or so above the average price, he saves you the trouble of having to get up at 2:00 AM to bid on something. That convenience is what matters to some people.