What is almost more amusing is that one purported associate professor claims that a higher moment of inertia and flexibility in the cranks are advantageous over light, stiff cranks. I think I will go patent my springs attached to a lead disk crank now.
Another study with a small allegedly randomized trial on the Z-cranks own site shows no discernible difference between these and run of the mill cranks, but in somehow still concludes they are better?