Speedplay's Frog mountain bike pedals suck and are dangerous. At least this is my opinion from very limited experience. They suck because (i) there is not a good, positive click when you push forward to engage, and (ii) the forward engage motion is not great. They are dangerous because if you stand up and push down on the backs of your shoes to stretch your calves, you may find that the cleat pops backwards out of the pedal. This happened to me several times on my first ride, and so I sent the pedals straight back to where I bought them. This was probably in 2000 or earlier, so maybe they've fixed their problems since then.