I received these today and started to put them on right away, but noticed a three inch split in a thigh seam--ugh.  I thought, "Well, for $11, it's not worth the hassle to return them."  Then I noticed I paid $22--double ugh.  The fabric is thin, very thin, with just the slightest waffle.  Which will be great for moderately cold weather when I just need an extra light layer, but I'm not going to expect much more from them than that.

I'm 5'8" 150 lbs and wear a size 6, following the sizing chart, I ordered a small (which seemed odd for me to need a small, but the chart said...)  They fit well, but if there were five more pounds of me I'd want the medium.  Surprisingly, they're even long enough.  Another reviewer two inches shorter and ten pounds lighter, ordered the large and wished she had gotten the medium for a snugger fit, but that the legs rode high.  She also said they were well-constructed and a medium waffle.  Clearly, different experiences.  Perhaps they've changed the sizing and quality and manufacturing between last year's run and the current one...?

The HUGE upside to these is the style.  I didn't want a pair of leggings made to wear at my armpits like most of the others I've had or looked at.  They're a perfect mid-rise fit and the wide waistband is fantastic--I hate having to tug my underwear up throughout the day.

If I had paid $11, I'd order again and risk getting another pair with a split seam, but I don't see how they could be worth any more than that.