I personally would love to see a group buy come to fruition, even though it won't benefit me as I already have the adapter. It would be good to see more rigs with this setup out there.
As far as dealing with Dustin, I agree it gets frustrating when parts aren't delivered when you expect them to. I have dealt with this myself. As of yesterday I now have received every piece of my kit, the wiring harness was all I was waiting on. I will say that I do not beleive there is anyone that has been burned by Dustin, the frustration is limited to extended delivery times, no one has lost any money to my knowledge.
As for this group buy, I can tell you that Dustin designed and turned my prototype adapter around rather quickly, this was not one of the parts that I was waiting long for. If you are in the market I say get on board.