· Does the player support audio books?
As long as the files are in one of the supported file formats, they will work very well on the player.
You can even use some of the player's advanced features (bookmarking, nested playlists, and the "Ignore as Child" tag) to make the audio books even more useful.
If the audio book file is not in one of the player's supported file formats, you can usually convert it to the proper format with very little hassle. Even if it's a copy-protected format that requires a proprietary piece of player software, you can use something like Total Recorder to convert it into the desired format.