My first arranged sale at TFCon 2008 happened to be with CobraCommander; sold him a MISB BM T-Wrecks and loose-complete Cybertron Blurr.
Great guy, we hung around together during the convention. Would definitely deal with him again in the future.
Sold CobraCommander an Energon Bruticus; he received it last Friday (Dec 12th), but I was too drunk from coming back from my company party to leave him feedback then.
Anyhow, not much more to add that's any different than any of the above posts. Great communication, great friend, and whatever else you want to throw into the mix.