Every summer since we started our laptop program, my department spends a week or two (or has summer help) re-imaging the returning student computers. We have done this because the Windows machines have been so junked up and needed to be cleaned up. We simply don’t have that problem with the MacBooks. We will need to run software updates, and maybe install a couple applications, but we can use ARF for that.
That being said, we still may re-image them simply because we are making some changes to our master image. The point is, we don’t NEED to re-image them.