How Well Do Ubiquiti Mounts Hold Up?

Some integrators I've spoken to have started to use Ubiquiti, but they have doubts as to the longevity of the mounts/housings, since they're all (generally) made of plastic, not metal.

For example, the NanoBeam has a pretty clever ball joint mount which is really simple to aim:

The question is how well these pole mounts last after years exposed to direct sunlight and freezing temperatures.

In setting up for our upcoming Ubiquiti test, it does strike me as a possible failure point, as most manufacturers (wireless, camera, otherwise) generally make outdoor mounts out of metal.

So, the question: what has everyone's experience been with Ubiquiti's plastic mounts holding up over extended periods? Any failures? Or is this simply a non-issue?

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