I agree w/those who say you can't be sure the guy doesn't have two, or even more, of the same units. I have met at least two guys on this site who constantly buy and sell stuff and make a little money in the switch. I'm sure they have owned the same piece twice or have had two of the same pieces at one time, some people really enjoy the experimenting w/new stuff and the bargaining and small profit-making they may be able to pull off. I myself have bought and sold quite a few pieces, large and small, over the last year, but have not made ANY money in the transfer, oh well. I haven't lost too much, and every piece was something I wanted to try.