Plastic Plumbing WARNING
I am a fabricator.
Over the past 14 years we have occasionally done a tear out/re-install of granite tops due to a water leak which damaged floors and/or cabinetry.
The last few years we have seen more and more of these incidents. In almost every case the failed plumbing was the plastic tubing and fittings which are replacing the traditional copper plumbing. In every case where I have the details the failure was not the tubing but rather a cracked or split nut or other type of fitting (probably because it was tightened too much)
If I was building a house I would insist on copper plumbing.