This is a very comfortable pad. It's fairly light for such a well-insulated, comfortable pad, and it folds down to a very small size. Hiking in the Sierras where I normally use a 20 deg F down bag to stay warm with my z-lite foam pad, this baby kept me too warm with the same bag. Might have to get a 40 deg F bag instead.
This also doubles as a nice flotation device for those cold 11,000 ft lakes.
Only gripes are that the stuff bag (which doubles as a pump and pillow) is a little on the large and heavy side. It has some unnecessary foam padding in it, which would probably be good if you were stuffing your pillow with glass shards, but is unnecessary for a normal clothing-stuffed pillow. They could save a few ounces in weight by making the sack with one layer.