A new golf club is going to increase your yardage, better headphone cables are going to elevate your listening experience to a new level, $700 HDMI cables are going to be superior to the monoprice crap, clipless is vastly superior to cages/pedals only. No one's going to pay attention to real data in any of these cases, or better yet they'll run on a counterclaim supposedly proving why their stuff's better.
More interesting IMO is that the traditional cleat position is less efficient than it really can be; there's been a few articles about this, and Joe Friel's also concluded w/ his power meter testing that toe cleats should be mid foot cleats if you want the most bang for your buck (he claims a 9% increase in power):
http://www.trainingbible.com/joesblo...-position.html
Even faced w/ info like this, you'll notice that most people commenting try as hard as they can to justify why their investment is sound.
So where is it that Friel says to use cages in lieu of clipless?