UPDATE: This app saves me so much money! PLUS I emailed the app creator about a query, and he answered and solved it - totally worth it. Worth the small donation that was only a very small portion of the money I've saved using the app.
-----
This is an amazing app - it works on both Amazon and Audible - it's perfect for when I'm curious about an ebook or audiobook, but don't know if I want to buy it to keep, or if it will go in the 'read once and forget' pile. Definitely a money saver! In all, a useful, unobtrusive app. It's a keeper :)