I have ridden Look style pedals/cleats and SPD pedals/cleats extensively, and I think that Looks are not really ideal for fixed riding. They suck for walking around in, they can squeak b/c of the plastic cleat, and they can be easy to come out of. I usually use Looks on my road bike, but I put them on the fixed gear for funsies and found out that they are much better suited for road bikes or any other type of riding that does not induce extreme upward motion.
Don't get me wrong, I do pull up on my feet while riding the road bike (every good rider should) but not with the amount of force that I pull up with while executing a skid.
Is this post moot b/c i said "funsies"?