Other than costing a fortune, I found no difference in this very expensive set of blades than the cheaper ones. Mine are a year old and I have to blast the radio to drown out the rubbing noise. THey leave streaks in the same places the cheaper blades left streaks. The only thing that impressed me was the nerve it took to charge this amount of money for these blades.Sorry, but I calls 'em as I sees 'em.