I originally saw these in the store but couldn't justify spending $52 on leggings. However, when I saw they were on sale, I had to pick up a pair. This is my first pair of "higher end" leggings, and I am very pleased. They are nice and thick and perfect for winter. I think it is cool that they are reversible as well. I am 5'3 and 105 lbs, and I didn't really know what size to get. I ended up choosing XS over Small and the XS fits perfectly. I might try on a Small in the store to see if it fits better and exchange, but I think it might be too loose. These leggings seem high quality, but I will have to wear them a couple times before I would justify buying them at their normal price. However, if I do end up really loving them, I would buy them at $52 since I wear leggings a lot. Overall I would say, if they are on sale, DEFINITELY buy them and test them out! If they are regular price, it's worth a risk, since you can always exchange. These seem just as good as quality as Lululemons at half the price.
The fabric is a great weight and thickness, holds you in without being constricting. Will work for lounge wear or even as pants tucked into boots. I'm 5'4" 130 and ordered size small.