The fixing of the Nexus 5 in the holder works very well and the fuse through the rubber serves its purpose. Buttons are still reasonably use.
But I realized after 1000 km a stress fracture in the area of the ball head. I was lucky that the Nexus did not fall directly on the street.
I have been around 1,000 km at tire width 25 mm to French and German country roads.
This product seems -How many competitors also- not be designed to suit the load.
I can only advise not to use this product for serious long missions.
CONCLUSION: Good solution to the attachment for the phone - but unfortunately not designed to meet load requirements and therefore the longer a danger for mobile phones.