Originally Posted by Mr Pheer

Much easier than a standard heli because the flight computer is doing all of the hard work for you. You just tell it where you want it to go.

It pretty much uses the same sensors from a Wii controller or an iPhone to tell the computer what the aircraft is doing, which direction it is facing, if it is level or not, etc etc.

The coolest thing about these is that the hardware is open source... you could buy a board and program it to do your own things.