There's been a few mentions of DD hammocks on the forum. I believe Nigel P uses one so hopefully he can add to the knowledge base. They seem to have been around for a while and look like a good option for somebody looking to get a double layer hammock.
What I have picked up in my research, The old ones were a bit small so the size has been increased. People don't rate the tapes that much, the Tarps are big and a tad heavy.
I wouldn't mind it being added to the list of manufacturers. Being UK based it's one of the hammocks I considered before I went DIY (though I have just got hold of a lovely Nomad xxl)