I have used the blue ccf in my HHBPUL with bottom entry. It was a straight unmodified pad (no SPE). I placed a wool blanket over it to lie on, which helped avoid the cold shoulder syndrome. There is a knack to getting into the bottom entry which entails rolling the bottom half of the ccf/blanket up, sitting down, and then lifting legs to unroll ccf/ blanket. The wool between myself and the pad likely helped avoid condensation problems others have talked about. I also did the woodsmans blanket roll which offers extra insulation around your feet. Remember to have him do a test hang somewhere with an easy bailout if needed.
Hangin' High and Dry