The Living Force
I also read e-books mostly in pdf or e-pub format, but I use app called Kybooks on my ipad. This one has some features like unlimited highlighting, text to speech( it supports many languages), tagging the books after completion, auto break after 25 minutes, space to write summary of the book, ability share to the highlights and summaries etc. along with normal reading. some of these features exist in Kindle too , but we need to buy both kindle and audible. The quality of Text to speech may not be as good as in audible. There are many other apps like Kybooks in different operating systems.Since I read them as e-book on my kindle, as soon as I have finished one I move it to a section called Romance books. So it is easy to see how many that i have read and of course which ones.
The ability to switch between reading and listening helps me to use little pockets of time doing other activities like walking , cleaning, cooking etc. I had a ipad case that has flexible hand strap that makes it easy to listen to it, even if I have to go. Generally the story lines are well written, easy to follow and gripping that makes us to continue to the finish( either reading or listening).