Pretty good, with some annoying features. The layout is attractive, but it premieres showing books you might want to buy instead of giving you your own book list first. Also, I can't buy books through the app, so what's the point of shoving books in my face that I have to go somewhere else to buy? On the technical side, I listen to audiobooks on dog walks. Despite having a strong phone signal, the app sometimes stops streaming. I got around it by downloading the book to the phone.