Comparing APC e-props to Mejzlik carbon props is like comparing "apples to oranges". Both are fruit but very different from each other.

The 20" APC e-props are just fine for 3D. You can see them [link=http://www.hobby-lobby.com/elecprop.htm]here[/link] at Hobby Lobby for about $15 U.S.

The Mejzlik hollow carbon props are superb designs but also cost $51 U.S. at [link=http://www.desertaircraft.com/page.php?Page=Mejzlik]Desert Aircraft[/link].

So, are you willing to pay an extra $36 before even trying out an APC e-prop based upon something you heard on the Internet?