Now that has not done my sales pitch any good
. I used it in a 9ft 6 blacker Hynson Redfin insired/influenced board it worked pretty well. i generally like to under fin my board so i switched to a True ames frye fin, which i have to be honest in my opinion is the best fin ever along with the 4a/MD3.
I heard the early one had issues with cracks (i read that on sways i think). Ill have a look in the old box of fins when i get a minute and see what i have, i along with most people i think generally like to keep the 4A style fins. There a popular fin, with good reason i think.