This is not exactly a UL item, but as a chronic night hiker, climber, skier etc. (not always on purpose) I took immediate interest from all the winter OR hype.
My schedule often has me leaving for multi-day trips at night, trying to squeeze in as many miles as possible. I hiked for 15 miles up over a pass on my first night out with this and it immediately proved that its worth its weight (6.5 on my scale). The trail petered out when I got to the divide and would have been hard if not impossible to find my way with my usual zipka. This thing throws a long beam. The light sensor tech works pretty brilliantly. Its great for switching between route finding and paying attention to the ground. Mainly though it just makes night hiking (something I already enjoyed) much more pleasurable and easy.
I also took it on the first night of a bikepacking trip on a fairly technical trail for about 5 hours. Considering I'm a pretty amateur MTB rider with an equally amateur bike, the night mission was probably a little ill-conceived, but the nao made it doable.
A few years ago in glacier NP, my bro and I were stalked by a bear (yes, stalked) for two hours with nothing but a BD ion with dwindling battery between us. Needless to say, I bought a brighter headlamp. One perhaps downside to the nao though is that you see wildlife that you probably don't want to see ;) Part way through my bike trip that night, I saw what I'm pretty darn sure was a set of very large cat eyes lurking in the distance. I didn't bother to confirm, but I've seen lions at night before and this is how it looked. Basically, with the nao you'll no longer have to wonder about that eery feeling that you're being watched by a creature of the night–you'll know it.
For backpacking where you arrive at camp before sun down, cook and tell stories around a campfire, this lamp is definitely not needed. But if you are a poor trip planner, predisposed to epics, or venture off trail at night, the nao is a real backcountry boon.

