I really love how there's just no way to read my books in the app. They'll work fine on my computer, and then I'll download them on my phone and try to read it there and I'll only get a nice view of the cover, no longer how long I wait or try to navigate. If I do manage to get it working, I love when it snaps back to a random page in the middle of reading, I find it incredibly intuitive to suddenly be 100 pages behind where I was reading for no reason.