I have a chance of buying "Boron Blades" (Boron is the steel they are made of from Germany and Spain) at about half the price of Original JD blades! Does anyone know if this steel is particularly better than the steel JD uses. In the brochure it says that they have ....... "52 Rockwell Hardness"? I figure that means there pretty tough but how does that compare with other blades? It goes on to say that people "report up to 40% increased wear" out of them. Any thoughts?????????