I took the challenge at the beginning of this year and then cancelled after the 28 days. Out of the blue I got charged USD59.99 in September without ever getting a new subscription. After contacting them I was told it has been an error in their system and that I will be refunded the whole amount. Which happened but they canceled the refund on paypal straight away. As I got back to them they told me the refund went through and I have to contact paypal. I think of it as a scam too.