I use LOOK on my riding bike and I think they're great. Have never tried any other clipless system.

I also think clips are wonderful and easy to get out of... I have to assume that anybody that thinks they're unsafe is just over-tightening the straps or something. I've been in several close calls that required me to slam my feet to the ground in a quick stop (drivers rushing through roundabouts, mainly) and was able each time to instinctively get out of clips. So anyways, I use clips on my commuter so I don't need to bring extra shoes, etc. All I know is that I don't think I can go back to platform pedals.