I bought these because of the decent reviews they got here and I put them on they worked just like any other blade.....it's not rocket science...no advanced technology here....evolution my A$$. They worked fine when I put them on but only 6 months later they were streaking and dragging water back across the windshield. It seems the bottom half of the blade now will not fold over when it swipes clockwise like it's intended and just doesn't work. I have this on two cars and I'm disappointed. I'd rather just buy cheap blade inserts from now on.