PEX has been used in Europe for a long time. Very reliable and yes, it's safe. I had it in my last house. It was built in 2001. As long as you have brass fittings , T's and elbows, you're fine. They started out with plastic fittings and they used to fail.
My current house has Poly-B piping Circa 1988. I'm worried about it as it has plastic fittings.
Most constructions here (Vancouver BC) are done with PEX these days. Copper has it's own issues. Many older places around here have to have their copper pipes pulled or lined. Don't fear PEX.
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