Rain sensor at the polo!!!

Once again hi@all! Who doesn’t know it. This “hidden rain, where you don’t have a plan, on which speed you should put the windscreen wipers. My grandfather therefore had a rain sensor installed in his Golf 3 at a private workshop in S-H. I really don’t want to advertise now, but I can only recommend any part of it. I had to have it installed now, because my windshield has to be replaced anyway because of a stone blow. There are f for the Polo 6N2 built in 2001 a special disc, especially for the rain sensor. But almost every VW workshop, advises from such a installation without a concrete reason. Supposedly too expensive and too time consuming. The company from S-H is unfortunately no longer available (with the device we never had problems) Now I have seen that the Frima AWS also offers rain sensors. This is also available at E-Bay. And the best thing is now. My question: Does anyone have any other experience with rain sensors that have been installed afterwards or even with rain sensors from AWS. mfg Jimmy