I wore the Ultra NX jacket and pant on about 18 rainy mountain hunting days last season in CO, NV, and the Sierras in CA. Plus a snowy overnight climb up Mt. Whitney. I've also spent a lot of time in Chugach seasons prior, and only bothered with the Yukon on one hunt in AK (where if doing it again I'd take Chugach or Ultra NX). The Ultra NX is a lot tougher than a guy might think, and I'd have no reservations relying on it on 90% of hunts in the US. The face fabric on the Ultra NX is nylon with a rip-stop weave which actually has a tear resistance very close to that of the "heavier" Chugach line. My Ultra pants have handled lots of climbing through alpine willow and seated glassing in the rocks. Still, it's a style that's best suited for those looking for ultimate weight savings on the majority of their hunts.
Otherwise, a guy is better off going the Chugach route for a little more longevity insurance (more so abrasion-wise, not so much tear-wise), and it's still pretty light too. It sure is nice though to pack the Ultra NX and have both the pant and jacket weigh and take up the same amount of space as most other jackets alone. And it does as good a job at keeping you dry as either of the other two styles.