The dark side of Apple’s digital textbook utopia | VentureBeat.
One of the problems with Apple is that it wants to commandeer market share by preventing people from having a choice. Even though the love for Apple is strong in Education, the fact remains that in Ed, “open is better than closed”.
This is not a lone voice in the wilderness:

One of the biggest problems when teaching mathematics is moving all the kids in a classroom forward, when some of the kids are stuck on challenges of algebra. You can’t really go onto higher math, until the kids understand how to work the algebra problems, and have mastered those skills. If not they will merely get all of the new problems incorrect, even if they know what to do, and are using the right equations for the right types of word problems.