My own experience is that a son of a friend of mine goes to a high school that issued iPads 2 to all of their students. There was a deposit paid by the families. The students understand they're responsible if the iPad is lost, and so they all treat them very well. I haven't heard of any problems with theft. Anecdotal, I realize.
And I'm not necessarily suggesting that the student or the students family is stealing it. How tempting would a room full of iPads be to a thief? Or how about a group of teenagers at a bus stop / at the mall / somewhere not watching their backpacks?
> Anecdotal, I realize.
All I have is speculation, so I think an anecdote is acceptable :)