I am a first-time user and sent in books the next day after I processed the trade. The Fedex tracking says it has been delivered three weeks ago. I have contacted Ziffit three times but have not gotten a response about trade number US_61648. Now I got an email saying that my order has been cancelled by ME, even though I did not, and have not even been able to contact anyone who works there. Please don't waste your time or money on this website. EDIT: This response from Ziffit was the only direct response I've ever received from them even after numerous emails to help.us@.ziffit.com, support@ziffit.com, and admin@ziffit.com. In fact, the only direct communication from Ziffit have been through the negative reviews I've written on three different websites, one of which they reported, despite being the same exact review as the paragraph above. I did not get payment three days after August 27th as they stated in their response here. My 1 star review still remains for Ziffit and I do not encourage anyone to use Ziffit unless you're willing to experience stress, confusion, unresponsiveness, and constant wondering if Ziffit is a scam.