I followed the reviews and buy the H107D, I do not regret it. Actually it's really excellent for beginners easy grip (command much more attention than on a chopper ^^), very small and handy for indoor and very fast, very good image quality (0.3M pixel) .
In OUTSIDE small problem that's not a real drone is alot too light, thus get out only if there is no ace or very little wind.
The battery life is approximately 10 minutes to one hour of charging.
/! \ This drone air as the indestructible, yet he have a weakness: the propellers. In some shock only are damaged, plan directly to the protection grid and first aid kit (with one or two extra battery if you want to go outside and do not come home after 10 minutes flight).
This is the best experience I've had so far, I love