Partly recommended buy, BUT it comes with quite some issues:
- videos get streamed from youtube! Which obviously means you can't watch them without internet connection.
- the interface is really annoying. No scaling options for the text, the "book" always goes fullscreen, but only takes a quarter of the screen, the "ingame" videos don't have basic options like a pause button.
- the readability of some text is plain awful.
If you like the game, and you're interested in some more content about it, i'd say it's worth the 0.49 on sale (or 1.99 regular). The delivered content is very good, the price is absolutely okay, but sadly the streamed videos, and especially the interface, is annoying and unnecessary.
Therefore i would highly recommend it if those issues wouldn't exist.