I bought the full Quest version, however I need to report a very serious bug with it.
The first book you open gets stuck once you open it.
Even if you open a different book, it'll still give you the first one you opened.
The only way to get it to actually load a different book is to quit out of the application.
Selecting the other book to read once you've re-opened the app.
And you have to do this every time you want to change books.