The acquisition of Gutwicklers was necessary because an identical model, which was then sold at the hardware store, had unfortunately given up the ghost. There no longer are ours at the hardware store, I had to resort to Rademacher. And I'm thrilled. For less money I have received a technologically superior product. A sun sensor was also present (at the hardware store normally apply). The device was quickly mounted (I had already experience with it). The Gurtwickler effortlessly creates the maximum possible weight to pull up and is even quieter than the old model. The sun sensor I have not tried, I use the time still invariably the timing. The delivery was fast and the quality matched the description. I would buy the part at any time.
