On the basis he joined the website today, refuses to go first, refuses to use a middleman, and has zero credibility which would indicate trust, I can provide whatever assessment I wish.
I'm an Official Middleman and try to ensure people aren't scammed. I'm not claiming the original poster is a scammer, but in addition to what I've listed above, he's posting from a completely clean IP address, which is naturally intentional.
I'm advising anyone who trades with this user to use a middleman and not to go first. The reward is not worth the risk. Of course he'll refuse both options, but given that, no user is put at risk.