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I haven't heard of any failures of Pex plumbing.
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Are you serious? nearly everyone I know who has had failed plumbing has had pex.
I know one dude alone who has had pex fail and flood his home no fewer than three times. All three times, it was in warranty, so pex fixed his house and the leak, but all three times pex refused to proactively replace any of the other fittings to keep it from happening again.
Even aside from the fact that pex had faulty fittings a while back, plastics just don't last forever, because the plasticizer leaches out, and the plastic becomes brittle. That is exactly what happened to my sister-in-law, her pex manifold got brittle with age, and burst.
In most areas of the country, copper plumbing will outlast the building itself. The only failures I have seen in my life with copper have come from improper installation (and it was noticed as soon as the water was turned on), or once when a gorilla horrendously over-torqued a threaded fitting (we're talking like 5x proper torque).
Now, some areas of the country, the water is corrosive to copper. If you live in one of those areas... well, pex is just as good as the alternative.