I replaced most of my basement plumbing and first floor runs with Pex (from copper). It made a significant difference in the kitchen, especially for the dishwasher. I had a high efficiency / low water consumption bosch dishwasher and it never drew enough water from the water line to get actual hot water. Now I run the kitchen faucet a bit to rinse dishes, and get the line hot before starting it. Also- I think that water hammer is greatly diminished with Pex- as it has some flex and give that rigid copper doesn't. I am so happy with Pex- I'm thinking of redoing it all again in a few months as a home run system, with all the shut offs and lines in one place in the basement. It is ridiculously fast and pretty cheap to use, and I have_never_had_a_leak.
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