The suction cup is powerful, it has never peeled off. The clip of the iPhone is easy to use and keeps it firmly in against it tends to rotate on its axis too easily, one realizes when a power cable is plugged into the iPhone. Furthermore, the hose is not rigid enough to withstand normal vibration (motor drive): the iPhone has a tendency to "waddle", which does not make a easy reference. I have not tested the other binding mode (on an air supply).
