Smells fishy
Note that Boeing are only "sponsors". This is all hosted on some kind of crowdw*nking site (herox.com) with lots of optimistic patter. The GoFly people may or may not know what they're talking about: as others have pointed out, the tech for this exists in micro-jets but you can't lift a person and enough fuel to make the required distance. In any case nobody in their right mind would strap on something with an exhaust temperature that would burn you to a crisp. The James Bond rocket belt would have flayed the flesh of anyone foolish enough to put a hand in the super-heated steam exhaust.
By the time you've added safety stuff, flight controls, redundancy etc. you've got an aircraft, not a "personal flying device".
My verdict: somebody is running a nice little scam.
Biting the hand that feeds IT
