I haven't posted in forever- been off the bike because of a car accident- but I have been lurking here occasionally. Just started riding again! I use clipless while mountain biking and wouldn't ride with out them. Occasionally I have fallen on the trail for not unclipping quite in time. And I have had one in-the-parking-lot-forgot-I-was clipped-in fall. My most spectacular crash was an over-the-bars due to hitting an unexpected drop-off while I was behind the saddle and I hit the front brake too hard. My whole bike and I did a somersault, before I landed on my back. I'm not sure when I actually unclipped, but that was certainly not the pedals' fault! I love clipless. Better climbing, better control, and no laying your shin open to the bone when a foot slips (my husband did that this summer).