Strong weaknesses

As a retrofit kit for wiper bought with steel shank. Installation of unarticulated wiper is carried out easily in 5 minutes and goes without saying.
The wiping pattern of the first tests proved 100% in order, especially impress the wiper due to extremely quiet running.
However: just in front of the driver starting from a small "Macke" grew within 6 weeks a streaky wiping pattern. The wiper is not about dirty, but just has a small quirk in the rubber and has become wavy from there and produced at each wipe about 50 strips. And that without winter use without high pressure cleaner.
Bosch best brand in the test? The Aerotwin surely not. The recommendation is clearly the "old" Bosch Aero with steel joints.