There is the old adage for any design, K.I.S. (keep it simple) and there is a lot to be said for the absolute simplicity of the cassette system. No cams, no pivoting points, virtually no wear points, never any necessity for fore and aft adjustment for tuning, etc, and their sheer simplicity overcomes a lot of potential (and real) problems that are inherent in all other rudder systems. I was initially doubtful about using the cassette system, considering it “old fashioned” but after extensive testing and use now, I actually prefer them to a “kick up” system