I'm about this far (holds his thumb and forefinger about 1/8" apart) from making the switch from Shimano SPD-SL's to Speedplay myself. Despite putting nearly 1000 miles on the Shimano pedals, I still have trouble clipping-in too often. The problem is exacerbated in the cold weather now that I am using toe-covers on my shoes, because they "deaden" the feel and make it that much harder to clip-in by feel alone. I find that I have to be complete about five steps perfectly in order to clip-in after a stop. It is less a problem on the MUP where I ride most often, but when I am on the road where I can be easily distracted by the surrounding traffic situation at intersections, it really becomes problematic and something of a safety hazard. The only reason I haven't switched already is that I hear that Speedplay Zeros have a problem picking up dirt which clogs the mechanism.