I didn't answer because I don't ride clipless (yet).

However.... Yesterday while we were at the LBS getting our bikes, a guy was there with his two young sons, getting something for his bike which was also there with him. Apparently, someone was trying to turn him on to clipless because I heard him say that he doesn't want to ride with is feet stuck to the pedals. About an hour later, guess what was on his bike? Brand new Shimano SPDs. He tried them on the trainer while he was there and found them to be a no-brainer. The owner encouraged me to give them a try when I'm ready.

That said, way back early last year the bottom of one of my running shoes stuck to the metal cage of my platform pedal and I went down while coming to a stop. That's my only "fall" so far...