As soon as my son began playing with these, one of the foam covers flew off.  We glued it back on with gorilla glue, and I suspect we'll have to do the same for the other side soon enough.  Forunately, we didn't pay much for them.  I would say we may have paid more than they're worth, though.  I gave them 3 stars simply because my son is enjoying them in spite of how cheaply made they are.