I wouldn't even wait to get damaged, I'd just take whatever cybernetics you got, hack the outdated models off now. Why would I want to be more human anyway? Your body's just a barely functional result of evolution's "good enough" mindset (if it had a mind anyway, you know what I mean.)
Edit: Just noticed you said works better than your damaged parts, not works better than a fully functional one. In that case yes I'd still get it replaced but only if I was irreparably injured. If we're talking about augments that are better than what we have even at full functionality, then my first answer stands.