I just got a Blackbird 1.1 DL for Christmas, and previously had a 1.0 DL I'm passing along to my wife.
Impressions: The 1.1 DL fits me better than the 1.0 did. I get a flatter lay, and no knee ridge like I did with 1.0. I am 5'8" 165 lbs. The ridge was fairly minor in the 1.0 DL for me, but it was noticeable, especially after experiencing the 1.1 with no knee ridge at all.
I hope this helps some others that might be wondering on which to choose.