I have been both a buyer and seller.
BUYER: I love the site! There is a great selection of clothes, great prices, and everything is in new condition. I bought a couple things for my 5 year old daughter and everything was even better in person than in the photos. And it was received pretty quickly.
SELLER: Okay, so it takes a long time to get any payout from the bag of items you sent in. Even if in your opinion everything was great condition they may only take 10% of the items and donate the rest. If you have a strong attachment to anything you can get the clothes they didn't accept sent back to you. Yes, they don't give you a large payout by any means, but it's convenient; they send you a bag, you put stuff in it and mail it back. Pretty easy.