I actually like the main rotor assy from the $10 one more than the one from the havoc. Instead of a top rotor, it's a plastic bar with weights on each end. No more chipping that little blade up there.

And it comes with more spares than the havoc too, a screwdriver, a couple pins, few spare tail rotors (and the tail rotors from the havoc (and pretty much everything else for that matter) fits on it).