I needed enough power to cigarette lighter and be able to fix my phone (the Nexus 5) other than the windshield. The couple of these accessories work perfectly. I had my doubts initially about the fixation on the product vents, knowing that it is for a Citroën C3 that has round shaped vents. Any fixed perfectly and keeps well up the phone while driving, even on rough roads that induce vibrations.
In addition, the accessory is quite small and so discreet, does not necessarily leave suction cup marks on the windows to indicate that there is used a GPS in the car. Anyway, it's small, it holds good, it's cheap. I am satisfied with my purchase.