I love the app, but it has a few shortfalls.
1. Only available on iPad and not iPhone platform...not very handy on the go.
2. Not really sure who designed the app, but they did only an okay job. It's not atrocious, but it doesn't work when you're holding the iPad vertical (like you would hold it for 99% of things so I'm not sure why). I find that extremely annoying. Also, it is not easy to exit things or navigate to other routines/events/levels. There's really no good way to do so, you either have to swipe through everything or try to pull down this menu which requires tapping around near the top of the left hand corner for awhile until something magically appears. If someone else knows of a better way to use this app please let me know.
3. That said I use it more than the book simply due to ease of access and not having to get out of my chair
I can't really think of anything the compulsory text has that I can't get on the app. The app has the video, and then when you swipe down you get the text with illustrations. You have to navigate to a different part of the app to get the general faults and penalties which again isn't very intuitive, so that could be what other posters are talking about.
Keep in mind the videos have a couple areas of mistakes, though they are minor text errors. Go by the text with illustrations and use the videos as a guide/visual.
