I purchased these (blue tint) and a plain polarized set for Ray-Bans that had cracked lenses direct from the company.  They were easy to replace and look good.  However, my nice Ray-Bans now have cheap drug store sunglass lenses in them.  I should have bought a $5 pair of shades from the gas station rather than replace the lenses with non-ray-ban or luxotica lenses.  These are plastic and turn nice glasses into cheap ones.  Next time, I'll buy glass lenses.