I just installed the BH upgrade on one of my blade cps. Installation was not a problem and the package even had printed installation information. I had a problem with getting lift off at first but i used the new e-flite pitch gauge and resolved that problem. Then the heli started to go into porpose mode. After being stumped for a while, I put on safety glasses and rotated the heli main rotor with out lifting off. I then saw that during higher speeds one of my servos would make slight upwards movements without any stick imputs. So I changed out that servo and it resolved that problem. Does anyone in this forum have any expeirence with rebuilding or rewiring the S-75 servos. It looks to me that the blade CX is using the same servos.except for the control lever. I flew the BH upgrade and really like how fast the heli now responds. I do agree that this upgrade would have been to much when I first starting learning how to fly because it is very sensitive. i cant wait until the weather clears so I can try this outside with my carbon fiber blades and lipo set-up. I would like to see more information on rebuilding servos and how to test and adjust them. I will buy new ones but it would be nice to be able to fix them in a pinch.[:-] Enjoy your new BH upgrade
Randy

The Thrill of flying is greater then the sound of crashing!