I believe the phrase “shut up and take my money” comes into play here. Aerofex’s description of their magnificent Tandem-Duct Aerial Vehicle:

In January 2012, Aerofex presented its recent work at the American Helicopter Society Future Vertical Lift Conference in San Francisco. The technology discussed utilizes ejector dynamics to augment the thrust and control of ducted-fan aircraft. The goal of the effort is to simplify vertical flight, in this case by eliminating the complexity of cyclically-variable rotors.

I haven’t the foggiest idea what any of that means, all I know is I want my own speeder bike.

(Via)