Product review (4 stars): Nice Little Product
For as cheap as this product is, it works surprisingly well.  It's not going to replace your regular bottle opener, but it is great for on the go.  It's incredibly compact, yet sturdy enough to get the job done.  The only annoying part is that you have to remove it from  your key chain to use it.  That can be a little difficult since the o ring has to open so wide to fit the thickness of hole.