I installed hs-55's in my heli and they are much better servos. The "drops" are less but PilotLight is correct about using collective and cyclic. You have to fly both sticks. I am working my throttle/collective stick most all the time. I have got to the point where my right hand works the cyclic stick without having to think too much about it and I spend most time concentrating on working collective/tail rotor. That being said,Istill need way more fly time. Still just a newbie having good fun.