I had my WB BB double 1.7 and after trying it out thought that it was the most comfortable hammock I'd ever slept in. I plan on doing another Long Trail End-to-End this year and thought I might consider taking a 1.7 single, for the lower weight, if it felt as good as the double.
The single came today and the first thing I did was to weigh each one in the Black Bishop type bag. The Double 1.7 (with webbing) was 35.7oz and the Single 1.7 (also with webbing) was 26.9oz.
At my heaviest (pre long hike) weight, which happens to be right now, I'm around 194# and I found that the single was enough to support me very comfortably, and almost as flat as the double. It's a breezy day today and I felt every wisp of wind go under my butt, something I didn't feel with the double. With the Yeti there will be plenty of warmth, even with the single layer.
For the 8.8oz difference in weight I'm going to take the single on the thru hike. Although it seems a small amount, it's considerable when taking into consideration my very lightweight gear.
Single or double, you can't go wrong with the Warbonnet.