I have had experiences with the Hitecs.. yes they will work.. BUT.. I would never put the lower end servos in my machines other than on the Throttle!.. I have had centering issues with the lower priced servos after a couple of flights... especially on the collective.. The higher end Hitecs and their digitals seem to hold up a lot better than the $15 servos out there.. There is a reason that the better servos cost more!...

I stick with either Futaba or JR servos now for all of my controls. but I have used the Hitec 525's for my throttles on a few machines without problems..

if you put those servos in "To start with" they will never come out as you will say they are working fine.. until they have a problem.. especially with the higher stress of a 50 sized heli.

just my 2cents ...