on slow theyre fine. on fast they extend too far, going off the windshield causing scratches and pissing me off. this happened after i replaced them with new wipers from autozone (rainx brand). they helped me find the right sizes using their little computer thingy. is the problem the size of the wipers, like they are too big and the autozone dudes hadnt a clue? or is it that the wiper mechanism needs tightening (i have no idea what i just said, it was a guess)?