The weekend before Thanksgiving I had a very long phone call with one of the Jacks (Pan) who was very understanding of all my questions and sufficiently geeky to be technical in good way. I placed an order and by the following Wed I had my shipment waiting when I got home from work! Due to the holidays, I didn't get to try it out until last night.
I combined the HH Exped UL with the HH Hex tarp and the Mt Washington-3 UQ and the Sierra Sniveler. I purposely slept in less clothes than I might camping to make comparable future tests. It got down to 19°F last night and we had our first dusting of snow. The wind was moderate, but the yard was partially sheltered by buildings.
I am pleased to report that I stayed sufficiently warm with no other insulation or reflectors. Just before dawn I felt a tad cool, but not enough that I couldn't get back to sleep. It was hard to wake up and have to go to work. Tonite should be colder yet so another test is in order!
Thanks Jack (and Jack),