Also, if you have any leg length discrepancy or varus deformity of the knees (bow legged), you're probably going to want some float, as the foot will tend to pronate when at the bottom. Most people have some kind of asymmetry. I had some ileotibial band issues, which I took care of mainly by making sure I stretched it a couple times a day, and before/after each ride. I use the Look Red cleats on one of my pairs of shoes, and the Gray cleats on another pair, and don't notice an appreciable difference. The Look pedals that I have(CX6 and Keo Plus), have a separate setscrew adjustment for how easy or hard it is to clip out.