I started using a NeoAir this year after using Thermarest pads for many years and I have never slept more comfortably in a tent. It really has made a noticable difference in my sleep quality and I don't have a problem rolling off of it. However, I have not used any Big Agnes pads to compare/contrast and I have not overnighted in below 30 degrees with it yet.
_________________________
“If you can find a path with no obstacles, it probably doesn’t lead anywhere.”
-- Frank A. Clark