\\ Positive
+ Safe grip with about 5.5 kg and rubberized bottom
+ Large area for attachment of suction cups - thus useful for many Navis
+ Robust and high quality
+ Super price
\\ Negative
- Seems a bit clunky, but this does not bother me, since I only have the car mount visible when I need them
- Very important: make sure that you have a dashboard with a sufficiently large, flat surface !!
By mounting saves you the hassle of mounting on the windshield and thereby the stains from the suction cup. Because in a minor accident or an emergency stop is usually the forces act in the direction of travel and the holder is placed in front of the driver, this sliding towards the windscreen. In serious accidents, the holder can of course represent an additional risk potential, but the one should generally be aware of.
For the price the holder is definitely unbeatable if you are looking for an alternative to be mounted on the windshield. Strong buy recommendation! :)