i have a freind who works at our lhs and flys helis in competitions with another club mate that is in the british display team,i am only telling you this to let you know that they are very,very good at what they do just so you dont think that what i am going to tell you next is down to pilot error.
the one that works for the lhs brought the new futaba 12 channel 2.4 set up at a cost of £850 to fly at comps, while flying his slot the collective reversed itself in flight sending his heli smashing to the ground after rebuilding it and putting it down to pilot error he flew again needless to say with the same in flight result after which they stopped him flying with that rc set up
he has now changed to spectrum gear.
this is the second person that i know that has regreted going to 2.4 at his cost (after loosing three planes in a day)
as i fly jets i cannot afford or want to increase my chances of loosing it in a crowd, this technology was supposed to help not put more doubt in our heads about safty.
its has not proved itself to me yet