I build and fly RC .. and I love the Kline-Fogleman device.
Its so simple, you can teach anyone to build one, and it will fly. Its so simple, one wonders if it could be the basis of a self-assembly/auto-assembly art project, whereby raw material is fed into the box, a crank is turned, and out flies a new airplane. This is a mind-experiment I've been toying with for a while .. automated assembly of KF-based airplanes.