Circling back to this post to let you know what I think of the Thermarest Neoair Xtherm after having about 12 nights on it this fall.
*Very comfortable pad. The user needs to play with the inflation level to find the right comfort. For me, the most comfortable inflation level is about 1/3 full. The pad still provides sufficient cushioning at this level. The pad looks very deflated at this level but when I lay on it - very comfortable. This also happens to save time inflating and deflating.
*Warm as advertised. The coldest night was about 25 degree F and I was using a 0 degree F rated bag. Needless to say I was plenty warm. The r-value is derived through heat reflective materials so under-inflating the pad doesn't impact it's warmth.
*Noise. Non-issue. This pad doesn't make the crinkle noise more common with the yellow lightweight version. Perhaps the materials and construction are different. There is some noise when you move around but not enough to complain about.
*Lightweight and compact. Stowed in the pack very nicely.
Once the snow piles up I plan to do some winter camping above Paradise so will put the warmth to the test.