My wife fell the first time she used clipless years ago and I have never heard the end of it. (I was standing there and didn't come to her rescue fast enough.) In thinking about it, I don't think I ever have fallen using clipless pedals, but in the old days of deep cleats cinched down tight with Binda straps, oh yeah, and it sucked. You come to a stop and forget to loosen that strap and whammo, down ya go, and was it ever embarrassing. I am a "vintage rider" and I love vintage bikes, but I draw the line with pedals. I would never go back to cleats and toeclips, ever. It is soooo much easier to simply click out in one leg motion than it is to lean over and unstrap so you can then lift the cleat up and out of the pedal.