Originally Posted by roadwarrior

Which is important information.

The opposite end are the Zeros. They are really tight. They loosen up after a while, but I've had customers come back with them (because the recreational rider could not get clipped in, for example) and exchanged them for Light Action.

Outside of what's been said, the biggest difference between Speedplay and the others is that their cleat is the "active" part of the pedal (the cleat grabs the pedal if that makes sense) and the rest the pedal grabs the cleat. If you have adjustability, you do it in the cleat in Spedplay, the rest (Look and Shimano, for example) you adjust in the pedal.

Having ridden them in a test, Speedplay works the absolute best if it is on a shoe designed for that cleat. The downside is that the shoes that are designed that way tend to be the more expensive ones.