Hi
I have a pair of Dura-ace and shimano have recalled the cleat for safety reasons.
The nib that opens the pedal on the 9 degree pedal breaks off and you are locked in.
The pedals have locked on me several times even with a perfect cleat because when the rubber blocks wear they go in on an angle and will not release,
you need to get out of the shoe and prise the cleat out with allen keys.
I have practically new £ 140 pedals but can't get cleats.
Freinds with SPD-SL and the new look sized plastic cleat has an aluminium extrusion glued along the back with -water soluble- glue!.
They just work out of the pedal.

And finally how many riders came out of pedals in the T de F.
( clue - discovery use **********?)

I now use Look, you can always get out. They wear out if you walk at all but they are very reliable. The A3.1 is great value.