Practicing mountain biking, I needed a really strong attachment to my smartphone. The system is quadlock intuable; the only time my phone fell is because the shell of the phone was disconnected, and that the body had fallen, but support remained firmly attached!
The only thing slightly wrong is that it comes off to be reused with a hairdryer. I wanted to withdraw my previous phone, but half of the glue was still there, so I preferred to 13 to purchase extra.