I just received my new wool leggings today and I am officially never taking them off! They are one with me, haha.
On a fit note: I normally wear a size 2 legging from Torrid, which I believe is the same as a 2X size. With that in mind, I initially purchased the XXL (the largest size Wool& currently offers) and was praying that they would fit. Imagine my surprise when they were too baggy! I have a friend who's a seamstress, and her thoughts are that it's almost like Wool& sizes the leggings as if they have no stretch - but these are quite stretchy and comfortable. So I exchanged for 2 sizes down and got a L, and they are a perfect fit for me. I like that they hit my waist and don't roll down. I love the size of the pockets, which are fairly large and are quite easy to get my phone in and out of. Even with the L I have a slight amount of wiggle room/roomy fabric at my ankles, but it's not a deal-breaker. The only additional request I would make for these otherwise perfect leggings is adding a compression/shaping element for the waist to the larger sizes. It would be nice to have that area be a little more flattering on the tummy rolls.
As for the opacity, they seem pretty good, but I wish they were fully opaque. My husband said when I bend over he could ever so slightly make out underwear lines/colors if you're looking for them, but hopefully nobody random is that close, haha. I am planning on wearing tunic-length shirts just to make sure there's no public wardrobe malfunctions, but I'm a bit bummed as I was hoping to be able to wear these for dance/workouts.
Overall though, 5 stars! They are very comfortable and function well as leggings, and I am happy enough with them that I will add more to my closet in the future.