Two reasons I went with the Exped - price (a really great sale) and I occasionally have to go to ground and I am a very cold sleeper.

Using the Exped in the Claytor with its double layer there is not much sliding around. I inflate it about 75%.

I also use a windshield reflector screen folded in thirds, placed under my rear end to avoid CBS (cold butt syndrome).

I am definitely on the way to an underquilt. I just have to decided what material. Lots of options for different scenarios.

My son on the other hand, is a very warm sleeper and does fine with the ccf pad and a reflective tarp rigged underneath as an airblock.