I swear by Speedplays, they have really helped with my knee issues thanks to their adjustable float. I have them on 2 bikes, Speedplay Zero's. I had an unfortunate accident on a roundabout 3 months ago, sprained my wrist. The bike slipped beneath me on what I assume was some sand that I had not noticed. Both my feet disengaged and I made no attempt to consciously do this, just happened. Bike survived with only a scratched brake lever and the edge of one of the pedals, no problems with it though.
Speedplays need maintenance, more so in wet, muddy environments but so long as you don't neglect this, they are brilliant. Lot's of idiots who've never used them passing around reliability issues from those who neglected them - bollocks, they are very good and ideal for those of us who need to stop knees from twisting in the pedal stroke.
