I would feel more comfortable buying a used piece that came back from the factory after a check up than from the seller with out a check up. I suspect the reason for the check up was due to a repair, but I would think that the manufacturer would want to do their best to send the product back in the best shape possible. Regardless of the reason for the visit, I would have more confidence in a used product because of the visit. Of course documentation and confirmation may be in order.
