So far, so good.
A bit of tapping to access menu. I haven’t figured out how to add hooks to my library. They appear to be added when a book is accessed; which means that I then have to delete books. 😒 Plusses are that the rewards seem simple, and there is a Free menu to choose from. Negatives are that there doesn’t seem to be a lot of books, and per chapter read is very expensive. 20 points, then 25 points and escalating. That’s not maintainable long-term.