I've been waiting for a pair of pants like these for forever. There are various softshell type pants out there for women but they're almost universally unflattering, and all so high waisted and stiff that being uncomfortable wasn't worth the technical function. Meanwhile, my guy has softshell pants that are so comfortable he wears them in place of jeans and even sweatpants. Ugh. So, when I saw these I had to give them a try. They're expensive, but I have to admit that Patagonia stands the test of time, so I guess I can get over that. They're comfortable, lightweight, and they actually look nice. My two complaints about them are relatively small, and probably not a big deal to most. First, the waistband isn't as much like yoga pants as I wanted it to be. The very top part has that rigid, less stretchy part in it that doesn't match the comfort of the rest of the band. All you ladies know what I'm talking about. If it had the same fold over top as the light and lined pants, I'd be over the damn moon. Second, the side panels on the legs, although allowing for comfortable stretch to suit a wider range of body types, isn't water resistant. It's a regular yoga pant/athletic tight type fabric. That helps make them breathable, but means they're not quite as weatherproof as the description may lead you to believe.
Bottom line - these are going to be great for xc skiing in the cold. I'll be comfortable and not look like I'm wearing giant old school ski pants. So. These stay, and I'll keep my eyes open for Patagonia to update these a few years from now.
For reference, I'm 5'1" 110lb. and the XS fits great. I could still put a baselayer pant underneath comfortably. Sizing up seems unnecessary for adding layers underneath.