They charge you $40 a month, whether you buy anything or not. I tried to cancel on the website after I bought my half price pair of shoes in Sept. In Oct I was charged the monthly fee.
I just had a VERY lengthy and heated discussion on the phone with them. They kept trying to sell me on keeping the membership, tried to tell me I could cancel anytime on the website (tried that twice already with no luck), told me I should have received notification emails (didn't get anything). Finally after threatening to report them for fraud and to file a dispute with my CC, they offered to fully cancel my membership and refund the charges.
I immediately called my credit card company to report the issue. I told them that they promised to refund me and stop payments, but that I don't trust them. The CC said they will keep an eye on the account.