All this is, is another tool that can be used for good or evil purposes. It's the human that determines that, not the technology.
For me, just a thing to make using technology less complicated, so I can focus on important things instead of figuring out which application or OS feature I have to beat into submission in order to get my work done today.
A medical professional will use it to control a probe inside the patient's body cutting out the cancerous tumor, an architect will use it to build a mock up of his latest project, lonely people *cough* perverts *cough* will have interactive porn, and a terrorist cell will practice beheading and blowing-stuff-up techniques. So it is with all tools, it's up to people to decide what to use them for.
When they try to pass the law requiring implantation of some device in every human's body for purposes of identification or commerce, be very wary.