I'm guessing there is a lot of overlap here with the author Brandon Sanderson (Mistborn, Way Of Kings, Wheel Of Time,etc), but in this case he has some interesting things to say about Audible, Amazon, book publishers, Speechify and Dyslexia. Look for the section entitled "AUDIOBOOKS for NON-BACKERS"
(oh, and the title of book 5 of Way Of Kings)