A good solution for those who are tired of having sucker marks on the windscreen. The bracket provides a large enough area for a suction cup and is therefore likely to be compatible for all common holder systems. In addition, the slip-proof rubber and stays in place, even if you sometimes have to stäker brakes. The three "corners" are filled and heavy enough to prevent it from falling. Of course, this is not the best solution. If the suction cup is not perfectly seated he can, as well as drop off from the windscreen, certainly. Did you but once fixed him neat, nothing should go wrong.
+ Low + Mobile (you can mount incl. Navi also just place put under the seat if you leave the car) + No suction cup marks on the window
- Seems a bit clunky - Could in an accident, like everything loose in the car, become a projectile
I leave the safety factor in the evaluation nonetheless disregarded, since this point only based on a guess.
Conclusion: Good and affordable solution for navigation systems with suction cup, which remains even in bumpy roads and more powerful braking in place.