I am looking at Gyro system and active fin Zero Speed stabilizers for a 92' motor yacht. I would like to get some opinions from anyone who has either one of these systems on as to how well they work. At anchor stability is most important to me followed by stability while cruising. The question is, which system is better at what speeds - at anchor / zero speed, low speeds and higher cruising speeds? Are they pretty 'fragile'? For either one of the system, would one need 'special' reinforcement or strengthening of the hull? I am concerned about the forces that the system will impose on the hull itself. Is there more drag caused by the fins and can it have an impact on speed? I read and find a lot of information about active fin Zero Speed stabilizers but almost nothing with regards to gyro anti-rolling devices. Is it because the latter is no good? I know that Ferretti yachts have gyro anti-rolling devices in their yachts, which is built by Mitsubishi. They must surely be using it because it works, right? But is it as good as they show it in their advertising...where there is this Ferretti that is rolling so much and comes to a relative 'stand-still' after its turned on (the gyro)? Any kind of input would be much appreciated.