I used to use Audible. I liked it but one minor annoyance was when you finished a book you couldn't delete it from your library. You'd have to go to the site and use the chat messenger and have one of their representatives delete it for you. Funny this is they usually misunderstand and not only deleted it, but credited back the book cost (basically "returned" it, rather than deleted it). Heh. Worked for me! (This happened nearly every time I wanted books deleted. I always liked that otherwise it got cluttered up).