Readdle just released PDF Expert 5 for the iPad and is requiring existing users to pay full price for the upgrade. They also removed the existing version from the App Store. Does that mean that if I deleted the current version from my iMac that I wouldn't be able to get the current version again? I understand that they need to get paid for their continuing development efforts, but there should be a better way - like in app purchases for new features. If you purchased the product last month you have to invest $20 to get what a new user gets today for $10! No loyalty to existing customers - and no reason for my continuing loyalty to Readdle. Since I have been put in the position of a prospective customer, I will reassess whether another developer's app isn't a better all around solution. The new version looks great, but I don't trust Readdle. I am afraid that next week they will want another $10 for the PDF Expert 5 for my iPhone!