One shortfall of plex seems to be the ability to remember where you got to. I like audio books and this seems to present a problem with plex. If I have to pause or leave a book, then finding where I left off is not really supported other than trying to manually remember the last track I got to.
A good enhancement would be the ability of plex to remember were in an ‘album’ a particular user got to and provide the ability to resume from that point - even if this was part way through a track.