My dad has a couple dual rotor ones.
They fly fine, but the battery drains quick, and I fear too much. It requires constant trims to stop it from rotating, and when you start running out of juice, one rotor overpower the other.
However, there fun on rainy days or when its windy outside.
The single rotor with a tail can be flown indoors, but is much more twitchy. More fun, but hits harder.
Overall, they are fairly tough, and spares are cheap and easy to come by. Ours are boxed because the batteries have all been worn out.