The Air Hogs Atom is a truly tiny RC helicopter, it fits inside the controller! It is also very cheap, $30 at Target. It is also highly detailed and very rugged.
That is where the good news ends though. It does not fly very well. Both my four year old son and I can get it to hover relatively well, but it is too jittery and unstable to get it to fly in any one direction. It goes where it wants, but mostly stays in one limited area, slowly turning in circles. This is after I twist the trim knob on the controller to stop it from just madly spinning which is does every time I turn it on. It spins and spins, don't be shy about twisting the trim knob, it takes about a dozen full twists before it settles down.
The instability might come from this heli having only one rotor, the type that has two is much more stable, like the Air Hogs Sharp Shooter. Or I might have gotten a lemon.
Tip: don't forget to turn the heli off before charging, it will not take a full charge if it is on.