Eh. You get what you pay for.

The product is 90% polyester...
They are soft, but have a very synthetic, cheap & unbreathable feel. I was not overly impressed with the quality of the seams either, this leads me to worry about the potential durability of the product.
The waistband is horrible! I never would have purchased the leggings had I known about it! They remind me of pajamas!
There is virtually no compression, but the opacity is pretty good, particularly considering the price point.
Also, I hate that they do not offer returns (credit only) "under any circumstances".
Contrary to some of the reviews that I have read, there is NOOOOOOOO (!!!!) way that you can compare these to higher end leggings.
You get what you pay for.

Poor quality

This product was mis-advertised and not the quality suggested. When I went to return them, they said "no returns no exceptions"!! I am out $300 and ended up donating them because the company just didn't care about customer satisfaction.

I purchased four pairs this weekend during a party. Yesterday I wore the first one and noticed pilling on my right leg. The seam ended up ripping while I was out running errands. I rushed home and when I removed them I was horrified. Bits of fabric covered the floor. The rep said she would replace them on Thursday. Today I wore the second pair and although not as bad there are tiny holes on the seam. I'm not even chancing the other two pairs and I'm asking for a refund. I'm a size 16 and ordered the plus which they claim fit up to size 22. I'm so disappointed.

I was pretty disappointed with the sweet legs I ordered. I has heard so many awesome things about these pants. Sure they are comfy but not really worth the price. I bought 4 pairs. Two pairs had holes in them in no time. I didn't even realize that they had a hole until I spent the day walking around showing off my rip. :(
I would rather spend the money on good quality leggings that won't rip after a few washes.