Here are some pictures from this weekend.
I don't know exactly what temp it got down to this weekend, I am thinking right around freezing because none of my nalgene bottles had ice in them in the morning (protected under the hammock in a pile of gear). It was very windy that night, though.
My top insulation was a 0deg down sleeping bag inside. I was quite warm. The only cold spot I had besides my face was my feet. After looking at the position of the underquilt in the morning it was apparent that I need to move it down about a foot or so to cover the foot pocket on the Warbonnet Blackbird hammock.
It was a great first hang for the underquilt. I can see my HG collection has just begun. I'm thinking a top quilt is in my near future. I may get a lighter/warmer weather set also - I can see the 20deg incubator I got with the overstuffing is going to be obnoxiously warm for anything above 40 or so.