Installed Kiwi on a Catalina 320 spring '08. Selected this prop as it appeared it would be a better performer than the original fixed three blade model while being both less expensive and less complicated than some of the competition.
Powers ahead as well as the original. Reverse appears a tad more powerful but for me the bonus is the reduced (not eliminated) walk to port in reverse. Under sail she should be faster but I have no way to be certain. I do JAM club race and I and the crew are all convinced that the boat points a bit better and is much faster recovering speed from a tack than with the fixed blade prop.