While replacing body parts with technological upgrades may not be for everyone, the person looking for an edge in their business dealings, or the person who suffers an injury and figures they may as well get an upgraded replacement, cybernetics allows you to replace your frail meat and bone with the hard titanium and aluminum of bionics. Of course, some people are concerned that replacing large chunks of your body with prosthetics might make you less than human and more like a machine - especially if those large chunks come out of your brain - but most of those stories come as a result of encounters with 'cybered' lowlifes who were every bit as nasty before they started upgrading themselves.