Jonathan Bolton wrote a review of Big Agnes Dual Core Sleeping Pad - Rectangular on August 17, 2012
I took 2 of these on a 3 night trip to Yellowstone at 2 different campsites. All I have to say is you better hope to have a pump to inflate the thing with you, or that you're not camping above 10,000 feet your your'll suck up all the oxogen before it's fully inflated. The night temps were around 34F. I staid nice and warm all night long and the pad remained tight every night.
I will note that I had an issue with one of the valves where part of it cam off. Once I got it on again and tight, I didn't have any problem.
If the valve problem prissiest I'll return the pad but just to get another.