The site was good (last year) for buying children's 'gently' used clothes online. The variety has decreased though and it's harder to find good clothes. That works ok.
The bad part is if you want to sell clothes. They pay you a ridiculous amount (cents) for the clothes they choose to re-sell (not all you send). It's not even worth the time to go through your closet and work to the post-office to send them the bag. You're better off taking to your local consignment store or donating to Goodwill.