You joke, but I always thought having at least one bionic limb would be cool.
But then you think about how there's no great solution for integrating them into your skeleton, no energy source compact and light enough, all the crevices that need to be cleaned, winter would wreck you, inevitable hardware failures an the rat's tail of problems resulting from that (we're outta those parts, sorry; buy a newer model?), firmware updates...
Nanomachines or bust, basically. The clunkers were outdated before they even existed.