I have bought used with no problems. While others have had sucess on ebay, that's the one place I would not buy gear, the reason being that I can't look at it myself first. I know many sellers are accurate on their discriptions but other are not. I just don't want to pay for "good" quality only to get something that was dredged up off the bottom full of mud. There are plenty of horror stories where this has happened. I would have any used life support gear serviced before using it. The warrenty issue is mostly a joke. If you read the warrenty on most equipment, it only covers the cost of the rebuild kit which runs in the $15 to 30 range, you still have to pay for the work, takes a lot of kits to offset 1/2 the price of a new reg. Taken care of, quality dive equipment is difficult to actually wear out. I have a reg and a BC from the early 80's (bought used by the way) which is still in fine diving condtion and I know of others on the board that have even older equipment. Bottom line is, we all dive used equipment, the only real difference is who dove it first.