Fair warning he's kinda a flaky buyer, so be careful.
I told him i had a black tabard and if he wanted it i'd pull it off the auction house and sell it to him. We set a price, he agreed, i pulled it off the AH and then when i asked him where he was he said, 'i'm not ready yet i want to try and find the hat first'.
This is particularly annoying since i specifically told him i'd pull my item off the AH IF he wanted it.
Anyhow, his indecisiveness cost me my 6500 listing fee from the AH so i wanted to give people a heads up so they are extra careful when negotiating with him. I'm don't think it was malicious or anything, but just make sure you protect yourself and be careful taking what he says at face value.