I love these things! I bought my first pair at Cabellas, because my husband suggested "polarized" lenses, and now I'm back on Amazon to buy my 3rd pair of the exact same ones.  (After about 6 months, I decided that there were too many scratches on the first pair...and my mom pretty much stole the second pair for an upcoming vacation because she loved them too!)
Works for me though, because now we BOTH have inexpensive, high quality sunglasses that we love.