I like the app like because they always keep me informed of new free Kindle ebooks. For me the app on your smartphone and tablet without any problems or crashes runs. The operation of the app is simple and intuitive. The structure of the app I think clearly.
If you have looked at a book and then goes back to the overview, the overview must first reload. This always takes a few seconds.
However, since the app is free and has already brought me a thing or two good ebook from me it the full 5 stars.