I went camping last weekend with my wife and some of our friends. My wife and I were in our totally DIY hammock setups: hammock, underquilt, SPE, sock. It was in the mid 20'sF Sat. night. My watch has a thermometer on it, so I thought I would test the warmth at the various levels. 1. Outside=25F. 2. Under Hammock Sock=45F. 3.Under top quilt (aka unzipped sleeping bag)=75F. I took the readings at 2 hour intervals (1.@10pm 2.@12am 3.@2am) to let the thermometer aclimate to ambient temps. We hated to get out of the hammocks Sunday morning since there was frost over everything, but our fellow campers had gotten up early because they were freezing in their tents.
The only problem we had was the condensation build up in the sock near our heads. I am in the process of looking through posts on solving this problem.
Can't wait for the next hang!!