I purchased this pair of black leggings because the only pair I owned previously was see-through. I'm so happy with my Ultra WW leggings. They are comfortable and definitely good quality (not see-through). I am 5'10" and 145lb. I ordered a medium which fits great. There is a bit of bunching of extra fabric at the bottom of the ankles, but other than that the width and length fit great.
I haven't worn this for an extended time yet (waiting for fall to arrive and the weather to cool down), but so far so good. I am 5'5" and 123 lbs, and I got both the XS and the S. I'm sticking with the XS because I had a visible outline in the front area with the Small (ladies, you know what I mean and this was a big YIKES!). I got the black and the gray. I learned that with leggings you need to go with the snugger option vs the looser one because the looser one may cause folds in embarrassing areas. So size down if you are between two sizes!
These leggings are great. The fabric is soft yet thick enough as not to be see though. I purchased all 3 colors and cant wait to start using them in the fall. The anniversary sale price is a great deal. Very versatile and essential wardrobe item. Size runs true and they are not short at all which is great (I'm 5'8).
These are good basic leggings, especially for the price. The wide waistband is really nice. I marked down a star because I do think they are a little thin and I don't anticipate them last very long, but hopefully I'll be proved wrong!