On the road bike a few times but I also fell with toe cages. I find them much more dangerous myself. I still cannot unclip right side much to my husband's frustration.

On my trail bike I have had a couple falls for failure to unclip. I now just leave the left unclipped. I don't like the pedal system but am not ready to try another. Maybe I should just get a platform for the left side? How Fred could that be? And would I really care? Nope.