Positive
Even without Navi (with me the norm) and despite shaky appearance occurs no rattling or even falling, even on Holperstrassen.
The single prop keeps the weight and Navi is easily visible and accessible.
Fixing takes place over a relatively large knurled wheel, not by a screw.
Neutral
For removal, you need a knife or a very flat screwdriver to carefully disengage the hooks of the two brackets, a daily on / dismantling is not recommended mE
Negative
A little guide, especially for mining, should be part of better.
I needed a while to all "displaced", "Fold", .. understand.
Conclusion
I would buy it again, before installation, I recommend a "measuring" about the right fins series to find, please also paying attention to the bow of the ventilation.