Very nice review Devon!
I have a guess as to how the "batwing" blades push more air: the reason the blades are swept forward
is that it decreases the angle of attack (which is quieter) but then the air "slips" in towards the hub. So, the "kink" in the blade stops this slippage somewhat and that part of the blade pushes more air than it otherwise would. And since this is at the middle of the blade, the linear speed of the blade is greater than in near the hub.
Also, it is also a 9 blade fan -- maybe they are comparing it to a 7 blade?
An aside: if the blades were swept backward, then the air would "slip" out and off the blades and this would greatly decrease the amount of air that was shifted. And again straight blades are noisier, all else being equal, than swept blades. So, that's why almost all fans have swept forward
Here's a 3-pin 1500RPM version of the Magma fan: http://www.newegg.com/Product/Product.aspx?Item=N82E16835214001