Speedplay, push down to clip in. Need some getting used to the clipping in method as it is different from the rest. Once it get the hang of it, it is fuss free. Unlike typical clipless where the cleat is on the sole of the shoe, speedplay's cleat is the pedal and the clipin mechanism is on the sole of the shoes. Free float is adjustment via the side screws.
Pros 1) durable, almost maintenance free 2) no need to replace the cleat (pedal) some riders have 30,000 miles on them and still using them.
Cons 1) New ones need abit of running in. 2) higher learning curve?