I got my D1 from these guys.
My experience is mixed, as there were some discrepancies between the description and the state of the truck that I used to negotiate a better price point.
I love my disco and for the most part has treated me well over the last year and a half, but I would just say that some of the descriptions appear to be used for most the trucks they sell. They use the terms "no rust anywhere" and description of "no evidence of any electrical problems" loosely as they used this as the description on my truck, which definitely was not the case. Also, the truck did not have 4 matching tires (as they described) and the suspension was in an awful state relative to the description of it being in excellent shape (did not matter for me as I was planning on swapping to AT's, steelies and OME lift anyways).
The price I negotiated was somewhat reflective of these issues but not entirely once I peeled back the onion. I'm a firm believer of putting the responsibility on the purchaser (which in this case is me especially since i checked it out in person), but I do have issues with the way they may market trucks online to buyers who can't physically check them out. Trying to be objective here without pointing fingers, just stating the facts around my experience.
Just my 2 cents, but if I was paying $6k+ for a D1, I would definitely check it out in person if you can.