Rating: 3 / 5
Me: I'm not exactly a UL hiker - 5' 10" and 220 pounds. I move throughout the night sleeping on my back and both sides. I am a cold sleeper.
Use: Regular size (72 x 20), 2 nights in the 40's on a trip in northern Arizona. One night with my trusty Montbell #3 and one night with a EE quilt.
The first night, I used the pad on slightly uneven ground (not completely flat and downslope left to right) in a sleeping bag.
Good - Unbelievably small and robust. The fabric does not feel like it needs to be babied. The warmth was obvious. It wasn't particularly cold, but I'm still amazed that a pad with no insulation can provide such warmth. The thickness of the pad was sufficient to absorb the irregularities on the ground. The top of the pad has a sticky or tacky surface which did a great job holding my sleeping bag in place when I moved around during the night.
Not so good - with horizontal baffles, there is very little definition to the edges of the pad. Throughout the night, it felt like I really only had about 10 inches of usable pad when I rolled onto my side. I let some air out of the pad to see if I could stabilize more, but I still felt like I was essentially balancing in the middle of the pad when on my side. Noise wasn't a particular issue, but it the pad is loud compared to others I've used.
The second night, I slept on more even ground with an EE quilt on top rather than a sleeping back.
Good: as mentioned, the pad is warm. It almost radiates heat.
Not so good: I still felt like I couldn't use the entire width of the pad when on my side. If I got too close to the side, the pad felt like it would escape. Additionally, the slightly tacky top surface that worked well with my sleeping bag, was a real issue when using a quilt. The pad kept *me* in place and made it difficult to roll onto my side.
TL;DR - nice warm and light pad, best for those thinner hikers that don't move around much at night.