ipods and ipads. Hassle or helpful?

Elementary teachers have been in a classroom with wild little kids, but high school classrooms are another level of craziness. High school students would be tempted to listen to music, play games, etc, which would distract them excessively. Then again iPods and iPads can also be good learning tools sometimes also. There are apps that we could use for maps in geography or apps for math, but I think they would be more of a hassle than a than helpful because most of the high school students would get distracted.