I love how easy it is to change cleats. There is never guesswork to have the cleats in the same place every time. Since its separate X and Y axis screws, there is never the fiddle of nailing the new cleats in the same place.
There is also a shit load of float, and there is no restriction in the float, so the pedal doesn’t “push back” from the float if that makes sense.
Like @Power13 said, no recentering 
I have leg length issues, so need 6mm shim under my right leg, so in that sense, speedplay has been a life saver!