As discussed by Koush here:
https://plus.google.com/110558071969009568835/posts/apks3X53... the headline feature of Vysor is actually the ability to share your running instance of Vysor across your local network or even the internet. Those in control of the Vysor instance are able to remotely control it, as well as issue adb commands remotely.
Edit: And all of this without root!
