Yesterday on Facebook, a teacher friend of mind complained about these things disrupting her classroom. (She actually expressed it a little more strongly) . Apparently, she is not alone.
Some kids really need this kind of sensory input to help them focus, help them stay still longer etc. But they seem to be causing an issue for teachers.
SFGATE printed a story today that shares just how much teachers are being annoyed by these little fidget toys
http://www.sfgate.com/technology/businessinsider/article/Eff-These-Spinners-Teachers-hate-the-11112925.php