Doesn't stay on
The cords are slippery so the metal clamp that is supposed to fit the strap onto the glasses slides loose and the whole thing falls off.  To make it worse, the metal things slide off entirely making the whole thing useless.  We only get about 1 month use out of each one.  It's too bad because my kid loved them.  Super glue doesn't fix it nor does E600 or hot glue.  We were using them on thicker plastic glasses which should have worked even better then trying to clamp it down on the super thin metal ones.
Rating: 3 stars