I've noticed that the newer A4's come with slimmer flexible wiper blades. Are these any better than the ones that came with my 2001 A4 B6? Mine do clear the water very well, but are very noisy. There is a knocking sound when the rubber flexes the opposite way as the wipers change direction. The knocking sound does dissapear at speeds over 65mph, but is very noticeable around town. I see that VAG parts sell the new type, but are they any good. They do look a bit light and cheap, but if they are quiet and shift the water as well. Do they float at speed or is contact maintained?