Oh, and final call on leaving negative: if it meets the criteria, call a spade a spade. Too many people out there worrying about retaliatory feedback; why? Anyone looking can tell the difference between retaliatory and deserved feedback.
Last negative I left was for a BIN item, which the seller then tried to get me to cancel the auction - without giving me a reason. I requested that he send the item. No dice - in fact, he relisted the item within the hour without a BIN (he did the same to an Italian buyer on another item listed around the same time) without even trying to further contact me to tell me why he wanted to cancel/relist. It came out that in both auctions, he'd supposedly not wanted to offer a BIN (both BINs were different). Most likely, soon after he listed he found out what the real value of his items were, but didn't pull the auctions soon enough. I and the Italian buyer both left negatives - mainly because he didn't wait for our responses to his request for cancellation before relisting both items. The Italian buyer actually contacted me and was just as ticked off as I, asking whether I planned to leave a negative! In the end, we both did - and no retaliatory feedback, either.