Well after 10 batteries worth the helicopter is still in one piece. Nearly lost it on a few occasions, one memorable when a bigger helicopter, in fact full size, passed over my flying position at about 30 feet. It was the air ambulance looking for a landing site to attend a road traffic accident. It frighten the living daylights out of me. Lost control for a few seconds but avoided the panic to close the throttle which would have meant a few things broken. Still getting to grips which the pitch and still a bit on the heavy side when it comes to landing but getting there slowly. Cheers