ThreadUp has great, high quality pieces at a good price. I see a lot of bad reviews for selling to them, but there are very stringent requirements for what they accept. They do not accept every brand, things that are out of season, or no longer in style. They have a very detailed list of brands they do and do not accept clearly marked on their website under the "Sell" section. At least one of the people who complained they "stole" her hand bag sent in a Gucci bag, Gucci is not on their list of accepted items. Once you send it in, you've agreed to part with it- make sure you're sending in items that they say they will pay you for.