+ The sucker really sticks well even if the surface is not smooth
+ Phone is tightened by the teeth and jaw did not fall
+ Vibrations are reduced to a minimum thanks to the many rubber parts
+ Can finely adjust the screen angle of rotation but also the tightening / block with a screw-clamp
+ Another advantage of the extension is to put the phone in front of the exit of the air conditioning allowing to cool and thus it can be used as a GPS even in bright summer sun.
- The only flaw of not being able to finely adjust the angle of inclination of the screen.
