I had this same debate last year when I was looking for my first lightweight tent for the wife and I. I ended up going with the 2010 DR after much debate. Ultimately, I chose the DR for better wind stability, ability to pitch without trekking poles, the rain porches and the ability to pitch the "fly" almost to the ground. Unfortunately (or fortunately), I had unbelievably great weather this year in the Colorado Rockies. I only had 1 crazy thunderstorm and very little wind in the 20 or so days in the backcountry.
I LOVE the rain porches. I almost always set them up now for ease of entry/exit and views. I've found that I really don't like zipping/unzipping a fly. I've never used a tarp but it's what I imagine sleeping under a tarp would be like. Seam sealing was easy with the 2010 version and getting the CF cross strut in and out is easy as well. I think Henry nailed this redesign based on all the gripes I've read about with the old version.
I'm 6'3" and my wife is 5'6" and we both fit fine. Not a lot of extra room but plenty for us. I use a large Neoair and my wife uses a regular. You could get 2 larges in there but it would be mattress from bathtub wall to bathtub wall. There's decent room to store stuff at both the head and foot.
Happy debating!
Chris

