[ogreyonder]

It's astonishingly elegant. I can't imagine nobody's thought of this before, so it's likely that the implementation is harder than it appears.

The added weight of the cage and gimbal system likely required them to use expensive ultra-light material and extra strong electronics. The motor on this thing looks pretty beefy, which in turn would require better driver components and a bigger (and/or denser) battery.

That said, I hope they can get a production version (made of syrofoam maybe?) so I can play with it. My main issue with hacking on quadcopters is how fragile they are.