I was looking for light weight, plastic frame, switchable lenses and wide coverage from sun.  The Fast Jacket do it all.  I own 2 pairs of the Oakley Wires, but do a lot of driving and wanted something lighter and that could handle all weather conditions.  You can switch the lens quickly and it fits firmly in the frame.  No lens jiggle and you can switch as much as you like without worrying about the lens closure wearing out.  I have had these for over a month and wear them everyday. Great sunglasses.