Bunki, I got one this year and I would give it mixed reviews. I teach
K-5 and the kids love it. They beg to turn it on and they remain fairly
quiet to keep it from going off. The older kids love it the most so it
might be good for middle school. It's great at the end of the day when
the students must put their stools upside down on the tables. We make it
a game to see if they can do that and exit without setting it off. I
must admit that I'm the one that gets tired of it and I'm sure the
teacher in the next room would like to toss it out the window!