As a customer who has paid for their premium audiobook service, I'd like to warn everyone about recent changes. Playster is going to limit selection based on usage. I listened to a book every two or three days, and have been limited to the sort of selection you can get for free at any library, as in books so old that they are freely available in the US. Why would anyone pay for this?
Also they don't do partial refunds, no matter how clearly the issue is their fault. Save your money and stick to more honest sites.