I guess that is where I don't see the difference. While I will agree the blade root is bigger than Zinger or MA, the hub is actually smaller. I have had stress fractures on my propellers. My latest propeller had over 45 flights on it and I changed it. I am always landing in the tall grass and the grass has taken its toll on the propeller tips. Other than that, I have not had any problems with APC props. I would love to use CF but I can get 2 APC for 1 CF.