I have ridden Looks, primarily. I currently have the sickly spendy carbon/ti version and a set of the cheap Performance Look-compatible. I tried Time (the latest magnesium version) and hated them. Clipping in/out was much trickier than Look (a piece of cake). But the really bad part about the Times is the cleat/float... the cleat can only be mounted straight, so any pronation, etc., in your feet/knee is handled via the float in the pedal, which is self centering. It took 2 rides for my knees to ache like crazy. Baaaaaaaaaaaaaad design unless your feet point perfectly straight all the time.