I claimed through paypal about low-quality and overpriced content. I've used my premium account a couple hours (I chose the cheapest option 126 $). Most of cases like "List of McKinsey Interview questions" are just lists with 1000's possible questions without any other information. Or in place of case you can find there an article about Manager day, or comment from glassdoor or another site converted into case with mistakes. I asked for refund.
I received a letter that my account is inactive and my payment denied. But they still haven't return me anything!
I am still in the process, they just sent to me a Thank you comment from their site to approve that it is good!