http://www.csmonitor.com/Science/2013/0 ... eates-buzz
Benefits:
... the team that designed it said it was the first such object to fly in a controlled manner – represents a key step in developing insect-size drones that designers say could one day search collapsed buildings for survivors after a disaster, sample an environment for hazardous chemicals before humans are sent in, or pinpoint enemy soldiers or terrorists holed up in urban areas.
Some members of the team suggest that future generations of the bug could serve as a robotic pollinator for plants,
Dangers have been already suggested in a previous article: These bugs could be adapted to give killer injections or implant RFID devices as these realistic insects have excellent evasive techniques.