I'm a convert (unless specified by a client otherwise) I now use PEX exclusively. $45 buys you 100' red, blue,white,grey. you use brass elbows and T's and shut off valves, pretty much any fitting that comes in copper they make in PEX brass. You will need to buy a PEX crimping tool (Lowe's sell a kit for around $100) the tool kit will come with 4 different size jaw attachments.
Simply put you put a little copper ring over the PEX pipe , push on the PEX fitting and hen using your crimping tool you squash down the ring over the barbed end of the fitting...DONE
You do have a considerable amount of latitude for corners as you can simply bend the PEX on a slow arc to get around them. As well they sell "manifolds" where a main feed line comes in and you can feed any number of rooms from this point, without having to "T" onto another line. This helps tremendously with pressure drop issues when two systems are being used at the same time.
The time saving is fantastic, the cost is (after you buy the tool and I never need an excuse to buy a tool
) also a great saving.
TO me another big plus is PEX's freeze capabilities, it tends to just get a big bloated spot where frozen (like a snake after just eating) then as it thaws shrinks back down to original size, copper won't do that.....lol
pexsupply.com is a good place to start if you want to see just what is available.