Ridiculously fragile
I have been using these Magic Erasers since they came out.  They are, hands down, excellent at cleaning almost anything you can imagine.  One example of their cleaning power:  I had a key fob for a car that originally had white words and pictographs on it.  Over the years they had turned yellow from age and exposure to cigarette smoke.  I tried several cleaning products on it and none of them could even begin to return them to their white color.  I finally decided to try a magic eraser on it and it truly was like magic.  With just a few quick wipes over it, they were sparkling white again.<br /><br />Alas, I have to agree with many other reviews here on durability though.  These are supposedly extra durable but they really are a joke.  I've had them crumble in my hands even when using on smooth surfaces with little pressure (not much pressure is needed, by the way).  While cleaning the walls in my pantry, I accidentally (but lightly) ran the eraser over a wire shelf.  It instantly put a cut into it.<br /><br />I found a different brand here on Amazon that claims to be more durable than the competition, so I just ordered some.  They can't be much worse than these so-called extra durable Magic Erasers.
Rating: 3 stars