My last mount was already for the ventilation slats, but from a different manufacturer. This was stopped me after a few months use, and it was a lot of work, the broken part to fish from the ventilation. The new looks a little more stable, I hope that it holds now longer. Advantage over the old is that it does not rattle and still has this Justierunggschiebeteile case that you push from the front against the slats. Overall, the unit is in stable.
I use the holder in landscape mode and to have his feet removed as recommended. With it goes well, but then the phone sits just off-center.
Small Optical Disadvantage: The mounting is quite far away from the nozzles, could be built in my opinion a bit scarce. I am surprised that I have read about it in the other Bewertunge nothing. In contrast, the ball joint is quite handy.
A manual was with me here, but described two products. I have the version with the button that you have to press if you want to adjust the width. The shift-click system makes me happy. The instructions you do not need but really necessarily. Except maybe when removing that I have not tried yet, but it could be really difficult.