I lost a 30% Laser 200 to interference from someone flying a small electric nearby the club field. After I got over the shock of not having any control of the aircraft and watching it go down until it got below the horizon, I was angry. Since then I have just gotten careful. It will become a much more serious problem in the future, but I am not sure the sky is falling..YET.

(bows head to the spread spectrum gods in the radio business)...