At my old middle school, 7th and 8th graders got white MacBooks in a similar situation. They were mildly helpful, as the computer labs were always full, and it was nice going online to access extra related material, but it was pretty much pointless. The school division's filter blocked out pretty much everything (except for Hak.5, as I recently found out ^_^), and they blocked out the cool programs like Terminal. Thing was, they had a few 5TB servers in the library so teachers could send students work and so students could backup their work, but the only security they put on them was the internet filter, and a user/pass combo. Now, the school was split between the regular kids, and the gifted kids (us). The regular kids never did anything...good(grey hat I mean)...but we did, and often. Notes were electronically sent, and the wi-fi they put in at the end of the year didn't even have the filter on it until after they took the laptops back. But alProxy-Connection: keep-alive
Cache-Control: max-age=0
us kids got the universal password easily with some ingenuity.
Point being, know the kids you're giving the laptops to. Or, at least, give it some kind of security.