This weekend my son and I spent 3 days in the eno hammocks. The lowest temps that we hit on this trip were -6 deg F.
My son has a homemade quilt that lays inside of the bag and he used a 15 deg bag. Even with the low temps he said that he remained quite warm. I used a much warmer bag, -40bag, with a closed cell pad and 2 wool blankets under me. I was warm as well.
The weather was windy the first night but the tarps blocked most of the wind. The last 2 nights the temps were low but there was no wind.
I am happy with the results we both had with the hammocks. This is the first time that we were in the hammocks with sub zero temps.
With these types of results we may never spend a night on the ground again.