In short: This phone holder doesn't like bumpy roads combined with heavier phones. If that sounds like your situation than think about another phone holder, a suction cup one perhaps.
I have it holding a Samsung S9+ which is on the heavier side of phones with a case that's not light either. I have found that the magnets have been reliable for most of the time but I've had a handful of drops because of bumpy roads, and the "teeth" don't grab the vent hard enough so the holder slides out every so often. The rubber on some of the teeth have already started to peel off with only a few weeks of use.
All this said i still like the look and in general how it performs because most of the time I'm driving it will hold onto my phone strongly and easily in reach.
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