At our annual block party a few weeks back I quizzed a neighbor who is an orthopedic surgeon at a major local hospital. He was kind of dismissive of robotic surgery in general - basically he thought it mainly helps surgeons who are mid-volume be more consistent. The high-volume folks (in which category I suspect he falls) don't need it at all, and the low-volume folks are not going to do as well either way.
He did allow that the hospital where he works had recently bought a MAKO unit - implied it was as much for marketing reasons as anything else.