I love ThredUp. I have used them both to sell and to buy and have had great experiences with both. When you sell you do have to follow the instructions (only selling items in good or better condition in the brands they accept). Because they have high standards, you can buy with confidence that the items you receive will be top quality. If your items are stained, damaged, faded, etc. they aren't going to accept them - which I think is great! In insures quality items on the site for sale. You can cash out easily using paypal. It's super easy.