I got my DD Traveler and DD Tarp in March of '09. I like them both very well, have used them on buggy summer hangs and down to the -30'sF in winter.
I soldiered on with the stock webbing-stuff for about a year, then used Slap-Straps for a little while, and finally upgraded to AHE Whoopie Slings and straps.
Here's a few thoughts on the DD, based on my slightly older generation example.
The hammock is quite sturdy. On the other hand it is not light. "Cheap, light, good... pick any two" I would say the DD is reasonably priced and good quality but not light. This applies specifically to my double-layer Traveler hammock, I can't speak for all others.
I have slept in the hammock pitched "taut" and also with sag, I get along with it either way. I'm 6'-3" and do fine, but someone used to a giant hammock might like it less, I don't know.