I have a couple of ridge rests, they're great. right now, though, I'm using a mountain hardwear pad. it's not self-inflating, but it's pretty comfy. has a nylon cover over the foam to keep the foam from getting torn up, and quick lock buckles that keep it rolled up and let you clip two of them together. it was more than a ridge rest, I think I paid about forty bucks for mine on sale five or six years ago, but it's really lasted. I did have a therma-rest, but after a little while of use it stopped inflating itself, and wasn't that much more comfortable than closed cell pads.