I personally don't think the isolators are needed either. I use 2 6v receiver packs on 2 seperate switches plugged into 2 free channels in the reciever....Hitec digitals all the way around..... no isolator or the like. Over 200 flights on my 28% Edge without a hitch. I also have the AirWild MLP servo arms on all my servos except throttle. 3" on the rudder pull/pull and 1 1/4" on everthing else. Using the Rocket City/Dubro style control horns that Tom supplies in the hardware pack, you can get 50 degrees + travel on the surfaces. The arms are very nice. I personally like them better than the SWB arms myself. they put the load closer to the bearing on the servo ouput shaft.

Cap