I had a trade with him in 02/2008 that did not go very well.
Short version of the story: I sent him some xbox dev discs in exchange for a ps3 promo. He got the xbox discs (confirmed with me that he did), but when I hadn't received the ps3 promo after just shy of a month, he said he would send another one out to me as the first seemed to be lost in the mail. I never received the ps3 promo, and upon subsequently trying to contact diddydonn about the matter, never received a reply.
Action: Bought from
Item(s): PS3 promo games
Feedback: Communication was shyt but I received my items ;-)