The Knubster makes a difference
This fin has done exactly what I had hoped it would, and what it is advertised to do. Great! I have two boards it gets used on. A large 7' fish-style with a four fin setup which just needed that little extra drive and stability from a small centre fin. Perfect. And a 6'6" high volume board that basically wants to be a twin fin but slides too much without a centre fin. The knubster only gets used on this board in small wave conditions, and again works a treat.