For a while, I tried this one https://www.aliexpress.com/item/Univ...a-54b6a4f43488
I wanted something that would protect from debris and/or rain, and also seemed secure enough while having a slow or predictable failure. Some of those spring loaded or rubber band ones seemed too unpredictable to trust.
That being said, phone screens are hard enough to read in the sunlight, but add in another layer of plastic glare, and the vibrations of 100km/h and it might as well have been in my pocket. Ended up taking it off. If you really need the GPS, it might be better to stick in one earpiece and just go with sound.
Now you got me thinking though. Maybe I should try cutting out the top window and seeing if it's legible without it.
Edit: while it was on, I wrapped a few turns of electrical tape on the joint between the bracket and the holder. It wasn't tight enough to give me confidence.