The recent update of this app is awful. You can no longer buy books even if you are a member. You must purchase credits which are outrageously expensive, and use those to purchase a book. In the past, you could get older titles for $7.99 or reduced price on titles that you already have a paper copy of. Now it is a credit, no matter what, and each credit costs $13.33. How disappointing. I will be using this app much less frequently and will lkely cancel my subscription.