The suction cup holds super on the disc - only the disk with the adhesive pad in the car badly. Since most modern cars have textured surfaces, is sticking almost impossible. The adhesive holds just sticks too little. I'll replace it with a better, then the disc will keep hope. In the first experiment on the dashboard of a BMW 1 Series's the weight of the Iphone holder (Navigon) alone has been sufficient to the disc with a screwdriver and is completely fallen into the footwell. Nevertheless, the product itself is a nice thing to get the ugly Saugnapfhalter from the windscreen away.