But only then. Placed on a cold windshield in the car - no chance drops out immediately again. If the disc is slightly warmer and slightly curved, the holder attaches itself superfirm - he even stay tuned on potholes. The arms can be adjusted well and have a fine set of teeth in the joints. Thus they hold exactly in the desired position and do not move. Use it from time to time in the car with a GoPro. You have to try but about 20x until it finally stops. Others can do better holder.