Well, to install and setup the DD tail took all of 10 minutes once the debonder kicked in! I haven't put it in the air though yet. Reason being it turns the heli WAY tail heavy[X(] I don't have anymore time to play with it now but even moving the battery WAY forward, it is STILL tail heavy. I'm thinking of cutting off the bearing holder and then if needed, shortening the tail boom. I'm not sure of the length to cut it at though. Time for research.[&o]