Fell twice, but the clipless only slowed my ability to react. Both times it was my brain stopping & leaning left, which is what I always do, but the circumstances resulted in a right lean stop. Was so in my "muscle memory" moment, when I realized what was happening it was too late to react. No problem though, put my arm out and caught my fall on the ground so no biggie.

My wife fell twice because she couldn't unclip in time. I switched her to my used Look pedals that were REALLY broken in (too loose for me) and she had no problems since, now she's used to the motion and it's all good.