This is by no means an exception, but they work for their purpose. I had trouble cleaning some of them after a while, but a glass cleaner did it pretty well so I could use them again; although he hasn't cleaned it up to look brand new. Sometimes when you peel them off and then fold them, the dry erase material sticks to the bottom of another magnet. But as far as I know it doesn't cause any problems with the magnet sticking, just leaves a weird white pattern on the magnet. They are quite thick but hold up well. I've used them as regular magnets and haven't had any problems with them.
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