This particular Bosch windshield wiper set cleans very well and quietly, it is the best when brand new, but it only lasts for 1-2 months at most. They wear out very quickly, especially on the driver's side, leaving streaks mostly near the center, even transferring water that was previously wiped to the edge along the windshield. In practice, even insect residue during a trip, if the mechanism is activated to clean them, is enough to cause the rubber "blade" to lose good contact with the glass. Any debris/dirt must be wiped off both the glass and the rubber before each use, otherwise it will quickly cause visible damage/reduced performance. On the passenger side, it is common for it to lose contact with the edge of the glass, but it is not as bothersome due to its position. In an Alfa Romeo 156, at least, with the size and curvature of the windshield, this is my experience. I will probably switch to hybrid windshield wipers, hoping that the contact will be better and remain so over time, while still retaining some of the advantages of "flat" wipers.