Another problem with the LOOKs that I had is that the curvature of the bottom of my small cycling shoes caused the big cleat to get distorted when it was tightened down. When I first tried them (they were the only deal back in '87) I could not get out of them AT ALL. I had to put a bunch of washers in between the cleats and the shoes so that the cleats wouldn't get distorted and jam in the pedals. I used them for about 8 years after that, but I always had trouble getting out of them due to the leverage problem that missliz mentions (could not stop on an uphill) and fell over a number of times due to not being able to get out of them. I finally gave up on them and switched to SPDs, which I've been using for the last 8 years.