Well, I did my first trade this week via DakkaDakka. I felt a bit of anxiety because there is absolutely no safety net if the deal goes south, not even the tiny bit of protection that Ebay provides. It's a complete leap of faith, and the audience is so relatively tiny that you cannot just deal with people who have reputable trading histories.
Anyway, to make a long story short, it went off without a hitch except for one little thing. I traded a Baneblade for a Defiler and a box of Chaos Terminators. What I didn't realize was that they were both circa 3rd edition, meaning that the Termies were metal ( noticeably smaller than the plastic Termies) and on small bases. It was completely my fault for not researching it a bit more and rereading the post, so that was the only hitch.
Consequently, I may be giving away a brand new box of terminators shortly. Stay tuned.