I think I have about a dozen pairs of Zella live in leggings. Most are too big now since I've lost weight. I bought a new pair recently to get more options in my current size. The quality is dramatically different. The new fabric is thinner, see through, and stretches out quickly. So sad. I won't be living in these any more.
I wear these leggings to Pilates. They are extremely well made, comfortable and supportive. I am 5'11" and curvy, so I appreciate that they are truly opaque and long enough through the legs and rise to prevent pulling and shifting while exercising. I also like that the seams do not rub or chafe. I like these leggings so much I have purchased them as gifts for other women in my family.
I was skeptical paying over $50 for leggings, but they live up to the hype and are worth every penny. They're the most comfortable leggings I've ever put on. I bought them in black which is great because you can wear them around the house with your favorite sweatshirt or dress them up with a tunic and boots.