My house is plumbed using PEX trunk-and-branch, with the main 3/4 line coming in, splitting off to 3/4" to the hot water tank, and then a 1/2" trunk that all the other branch supplies tee off from. Hot water is the same, with a 3/4" line coming from the tank and splitting to two 1/2" lines.
The pressure changes when you are using a faucet or in the shower are very noticeable as other fixtures are used, particularly with the washing machine.
I need to do a couple of changes anyway (including adding an outside tap), am both experienced with and have all the tools for PEX, and don't mind spending a couple hundred dollars on this. How much of a difference will I notice if I:
Replace the 1/2 "trunk" lines with 3/4"
Replace the 1/2" trunk lines with a PEX manifold
I'm just looking for someone's experience/anecdotal evidence that it would not be a complete waste of time/money to do this.