Product review (2 stars): No Longer as Convenient (Was:  Almost Perfect)
Most headphones don't come with a screw, so they'll fall out of your ears if you're not careful.  Thankfully, this product solves the problem--well, partly:  another screw would make it perfect.  That said, the headphones look to be worth about ten cents, so adding another screw would probably drive up the cost significantly.  Still, I think most of us would gladly pay the extra $30 for another screw.

UPDATE:  They've updated the product and it no longer includes headphones, so I'm reducing the rating to two stars.  It's still a great deal for a screw, at just under ten dollars, but now we have to source the headphones separately and that's a major PITA.