I see no problem for learning...as you get more comfortable start turning the sensitivity of the CPD4 down until you can do it totally without...Leaving the sensitivity up a little even then might help if you get disoriented...its really not a bad device...Learning how to fly breaking parts all the time can get expensive, discouraging and a new pilot may just give up...at least the CPD4 can get him in the air having some fun instead of being depressed all the time from making an expensive mistake...its not for everyone but it does work...I have flown my Falcon 3D once when it was turned down all the way and I could do it with difficulty but I managed a 5 min flight and I landed...I do agree with your point though and not knowing what to do if the CPD4 failed would be disasterous to a rookie. Of course any part failing in flight such as lack of tail rudder control the CPD4 will be no help at all with the heli spinning like a top.