I have several that are past the ten year mark with no issues. I've used them for hot and cold, and to do a repair in a boiler system. I swear by them. If you don't damage them while installing they should last a long time. I guess it's possible the o-ring will leak with age but I highly doubt it.
Solder is way more prone to issues during assembly, cold joints, porosity, etc. as it is a technique.
I'm not trying to slag soldering or anything, I've done tons of it and it's definitely the way to go if all the stars align, but I wouldn't hesitate to install a sharkbite and forget about it.
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