As a person who reviews piping systems all over the country regularly for failures and failure modes, PEX is a good solid performer. The old Poly which was a precursor to PEX was a lawyer's dream. PEX type systems are used throughout Europe.
I really also do not know that PEX is much easier to install than PVC. They are both really light and mostly idiot proof. That said - any piping that can melt seems like something I would not specify to provide water to sprinkler heads that were properly laid out to cover a building. I, obviously do not make any rules, but I would not specify any pipe that melts. That is just my thought as an engineer. FYI - copper in Florida is horrible because many Florida water systems eat it in less than 30 years. PVC is bad in some areas because it can reportedly become brittle because of the water provided by the city - I have not seen extensive failures from this though - but enough people talk about it - so I would not discount it. No known issues with PEX and it has been in use for enough years now to give it a thumbs up. The only reason that I do not use it at my house is because I don't have a crimper! JoeJoe ᐧ ᐧ
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