"I'm intrigued by the Klymit Inertia pads. Anyone ever use them with a quilt?"
Yeah, they do not work too well for quilts unless it is very hot and you need the ventilation. As was said, they are really designed for sleeping bags.
I toss&turn a lot at night and found them to be less usefull than I thought. I took one on a 5 day outing, assuming I would get used to it...didn't happen. One night it was fine, I kicked up a bunch of leaves under it. I stuck my Sitlite pad under my hips and was comfortable. In lean-to's it didn't quite provide enough padding... I tried it inside and got my foot through one of the holes. On another night, it was outside and I half rolled off of it a couple times. I was hoping, because I like the idea that it would work well to keep me warmer than a pad for about the same weight.