I sail a Stealth without 'T' Foils and would love to try the T's just too feel the difference. I only have two conerns about T's the first is the nodding dog syndrome. I cann't see how they could reduce this due to how waves are formed (sea swell not lake waves) in the first place. Infact, T's could be slower in some instances. The other concern is that I quite often find myself sailing downhill with my windward rudder tip just flicking in and out of the water. When a gust hits using T's and before I can react the windward rudder might still lift out and when I bear away would the T prevent the rudder/hull to come back down as quickly as I would like whilst trying to bear away. If so this would counteract sailing 'harder' downwind. In saying this I have spoken to John Pierce, Jalini and Wayne and I don't think they would ever go back to normal rudders so their advantages must out weigh their disadvantages.