I had my Skyzones head tracker setup with my Spektrum DX7s one time. It took hours of fiddling around to get everything set right. Still couldn't get it to center perfectly, but was close. Took it out on my 550 hex, and promptly crashed! Might be nice on a plane, or multirotor in a big open space with altitude. But I quickly lost orientation around some obstacles, and went down. Have not messed with it since. Good luck.:tennis: