[Opel Astra H '04]: The installation was easy and was very smooth. Have these extra-only mounted when spring really began. Have completely cleaned when mounting the disc and the bearing surface. Have however in the parking lot at work gravel, which halt caused a lot of dust. Thus, the disc's just quickly dirty. The next rain directly actuates the wiper and it was all wonderful. The dirt was waxed's gone and you had a clear view. The only drawback to the short length (although not dramatically just is) is that on the passenger side is a little corner that is not wiped, which can be seen even in heavy rain ever. (For this reason, I have also the vehicle mentioned above, so that you can understand it).