Last week was the first time in a long while I've slept on CCF, and I (or rather, my back and hips) remembered why. Warm enough, but my 1" Prolite is a big step up in comfort. Unfortunately, when I got home I found two small cactus spines in the Prolite (which my daughter had used on the same trip). Easy enough to fix (although I never would have found the holes in the field) but maybe not so easy to avoid. We never slept near cactus, and she was pretty careful with the pad (which was in her pack) throughout the hike. So I can definitely see the advantage of a non-inflatable pad in that area in the future. I also preferred the CCF to an inflatable as a virtual pack frame.
I've never used a Ridgerest or Z-rest. In the experience of those who have, are they a step up in comfort from the cheaper CCF pads? The one I have isn't completely bare bones--it has a bumpy pattern on one side (~0.5" at peaks, 0.3" at troughs).