Needs stronger/more magnets
It is a great size and very clear mirror which is great. I didn't have issues with it at first, but what others said about the magnets not holding is true.  I have mine on a small cabinet about 1/3 the size of an actual school locker.  If I don't close the door gently, it falls off inside the cabinet when I close the door.  I can't imagine it staying on in a row of lockers with other folks slamming them.  I'll probably glue on extra magnets when I remember to do so, then it will be find.
Rating: 3 stars