I think it has been mentioned before, how much upper/lower arm strength is required to fly this Jetpack ? Jet nozzels on the end of flimsy arms, one slight twitch and the pilot will be going through the skies like a Catherine wheel ? How many jet engines have we seen mounted on a flimsy moveable pylon ? cannot think of any, they are all fixed to the airframe.
Maybe with the Catherine wheel in mind they should launch it on November 5th !