Also, if you are tired, or perhaps in hospital, you can listen though headphones or earbuds, and it will read to you (choice of male or female voices, and speeds).
No more shipping, and a lot of books are free.
Only niggle I have is that they often call something a book, when I think it is only magazine article length.
Batteries last about a month before needing to be charged. And there are rumours of a coloured version coming, though bound to be a lot dearer