had similar experiences when selling stuff on the internet myself (sold plenty and the majority problem free). it's not a nice thing to do, but you have to share your bad experience of the buyer with the forum before they bad mouth you. most people are happy with their purchases, but some seem to think that because they got a bargain there's something dodgy going on and so at the first sign of anything going wrong it's your responsibility. you're doing everyone else on the forum a favour by telling them of this trouble maker. what next, i get to return my tv to argos seven years after buying it because it broke?