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Straightening copper pipe is easy enough in the small (8mm) pipe as long as it's not for show. I've never used the larger sizes but I guess it would be easy enough to accidentally kink it. If it's going in an exposed area I'd stick with copper in pipe form, otherwise why not plastic.
Vibration is often a washer. It would be an electric shower where it's not so straightforward to check and repair though!
Airhead
Copper pipe, bought on a roll, how easy is it to straighten it?
And, unrelated, noisy pipes, getting worse. Happens when the toilet is flushed. Really loud now. It's mitigated a bit by running the cold tap in the kitchen. The pipe in the bathroom that seems to be the cause looks to be the cold water one which feeds into the electric shower. It vibrates like a madman.