For now, the support car I've owned: - Clamp shake well, are easily adjustable and allow to easily adjust the position of the phone - The mounting system is very simple, just press the phone until it locks. - The suction cup sticks enormously: whether smooth or rough or inclined flat plastic, no problems with the paste, it is even quite the opposite: we must be careful to put it on the first try, or else be prepared to shedding sweat to bead to remove it.
Clearly, for the price, I highly recommend this fixation.