I really loved the idea to have my rulebook always with me as an app, it could have worked out so good. But all in one its just badly programmed: The idea to scroll through the capitels and pages with horizontal and vertikal swipes would be fine, if the app could differ them correctly and if you have really bad luck you swipe over an special icon: you land either at the very front or very back of the book. The hyperlinkindex also happens to be a good idea but there are not enough keywords and if you click on the wrong one, there is a very long way back, because there is no simple return button. THe resolution is really bad, if you have retina it just looks like at an IPAD 1 or 2 ! YOu cant zoom in, the bookmarks are **** etc. Etc. IN conclusion: buy the book !