[mylife]

Its pretty hard to fly one of those even with gyros, let alone target and shoot.

The Quads are pretty stable.

I think opposing quadrant blades spin 180 out for stability.

All blades have independent thrust.

Fascinating.

[Professional Engineer]

Even the little toys with the contra-rotating blades are pretty neat.

[MV=PY]

Opposing props spin in opposite directions. This allows control of yaw (slowing down one set and speeding up the other maintains height while altering rotational energy).

They are very stable.

This one has a gps, compass, 3 linear and 3 rotational accelerometers. It carries a GoPro 3. If it loses radio contact it goes to 60' and returns to the takeoff spot.

Highly recommended (it's a blast!). ;-)

For real fun, google FPV.