hmm. Back in my high school days (about 6 years ago), my physics professor had one in his classroom and he used it for every lecture. It was good for him because he could do page after page of whiteboarding and then send us to pdf to review.

Of course this is pretty impressive 6 years ago. If they haven't changed at all since then, I wouldn't use them, I would just project a touchscreen computer and use a stylus.