These two helicopters are brilliant i stood on one the day after i recieved them, and to be honest i found it increadably easy to fix. after straightening the roter axl and putting the thing back together i could barely tell the difference. mine are still going now even 3 and a half months later, tho i cant help but wander if i should move on to an X gyrator or a 3 channel... i would however rate the single one of these as they are a little easyer to control, and do not waight them until you have got to grips with them!