A little slick, but otherwise great
I grabbed the large sized one. Received it the other day and I was actually really pleasantly surprised by the size of the package....very compact. I gave it a trial run in preparation for a multi-day even coming up in a couple weeks, so here are my thoughts.
Inflation: I'm a good sized guy and it only took 4-5 breaths to get it pleasantly plump. It's made of a typical ripstop nylon, so it's a little "singy" if you slide around a lot and can be a little slick / prone to move around. The valve is pretty typical of most air pads and self-inflating pads.
I'm not typically a back sleeper, but for those who do, the low spot locks you in pretty good. When trying it on the back, I put a bit more air in to give it maximum depth.
As a side sleeper, I don't think it is ideal for going straight to the sleeping mat...chances are it will be a bit thin to give great support by itself....but don't forget, it's an ultralight pillow, not a super deep base camp pillow. For me, I like side sleeping with an arm up, so with a little less air, it locked beautifully onto my arm/shoulder and gave great head support. I actually found it surprisingly comfy for such a compact pillow .
On the tummy, I sleep with my arms up and crossed under my head. In this position, my arms trapped the pillow nicely, so no movement there. I ran the pillow a little softer and found it quite comfy without bottoming out on my arms at all.
Overall, if you're packing light, but still want a pillow, I'd say this is a very good option.
Would recommend to a friend.