Though it is true that windshield wiper blades come in several levels, it is not necessarily true that the most expensive blade is the best blade for your vehicle. All windshield wiper blades are made of the same materials and are subject to the same corrosive elements.
If you are following your vehicle manufacturers recommendation to change your windshield wiper blades every six months, then the added expense of an expensive blade as opposed to a cheaper blade makes no sense.