Just installed and have taken one ride on bumpy roads

It stays put going over bumps and rough roads

trail biking might jostle it more but on a steady road its great

It fits my Samsung S10 plus and doesn't budge, even when I ride on rough roads.

I'll update further after I've ridden with it on bumpy roads

However, on bumpy roads it shakes or turns upside down

serves its purpose well for steady roads

I'll have to see if/how that affects the mount's functioning on bumpy roads

I mean, nothing...nothing, stands up to constant exposure to UV and heat and rough roads.

Very easy to mount, low profile so it looks great, but the phone bounces around a lot on rough roads and especially gravel.

Granted, I am only riding on relatively smooth roads, no off-roading for me!, but it's been very secure.

Even on a bumpy road, it holds onto the phone and the phone doesn't drop.

Installation was as easy as it gets, slipping the phone into or out of the silicone holder is simple, it holds securely even when riding on rough dirt/gravel roads, and the charge port is still accessible with the phone in the holder

The phone wobbles as it goes over