Our gen 1 rudders would loose it upwind in waves. Very annoying. Take a wave, then rooster tales and no helm. Step to the back of the boat, goof a little with the main sheet, they recatch and you retrim.

We're using the gen 3 rudders right now. So far I like them. They change the feel of the boat, it is far less twitchy than before. They haven't cavitate/ventilated yet, but we haven't yet hit the right conditions. Whether they are as fast is always the question in the back of our minds, but so far I don't have any hard evidence that they aren't.