I am an undergraduate student and one of my textbooks was hosted on this app. I wasn’t super excited reading the reviews prior to my download and worried that I was wasting my time, but I’ve been using the app for about an hour and nothing bad has happened. I can clearly see and navigate the tabel of contents to click to whatever part of the text I need— sure, it’s not a pretty layout by any means, but it gets the job done. If there are any other students who are required to get the app don’t worry about the rest of the negative reviews, as I have yet to encounter anything major. Will update if anything changes.