I was talking about that with some friends, but I don't think they would allow it. Imagine if the whole student section were using those things, it would be insanely loud. Too loud to hear a whistle.
The guys that sit on the other side of my section have them. They got them this year when we were no longer allowed to bang on the wall in the north end zone. I would love to try to set up something for everyone in the north endzone to have either these or cowbells.