I pre-ordered one when I heard about them, because it seemed to offer a lot of comfort for a side sleeper/toss & turner. I've used it on about 6 trips now and am very pleased with it.
One advantage it has over the X-Frame is no pump. You can inflate it easily with your mouth (or a mini pump in winter if you're worried about condensation) with just a few breaths and still get the firmness needed to sleep in shelters or hard ground. I can just about put it anywhere and sleep fine (watching for sharp rocks, of course). It is very comfortable as long as you don't happen to line up your hip on one of the holes in the pad which just happens to line up with a rock or root. I have slept soundly every time I've used it.
I also like that the pillow is attached, and that it has a centered baffle which holds your head in place. Previously I've used a flexair pillow and found my head scooting off of it at night. The only drawback is that the O-Zone pillow isn't very much higher than the mat itself, so my head isn't supported as high as I'd like. This is just a personal issue, I suppose. I just fold the pillow over onto the mat and it lifts my head up just right (although this sacrifices a few inches of pad space for my feet).
Overall, it seems to me a good compromise between the comfort of the Klymit Inertia XL and the light weight of the Klymit Intertia X-Frame (both of which I've used). It's only .2 ounces heavier than a regular-size Thermarest Neo-Air Xlite.
The weight is reasonable, it packs very small, and as a dedicated side sleeper I'd have to say it's one of the most comfortable I've used. I've taken it on a trip to the Smokies in freezing temps and it handled the cold well, or at least didn't seem any colder than my old Neo-Air Xlite.
Hope this helps.