Which is why I asked what model he was looking to get, can't be expected to know EVERY model of pedal speedplay makes now can we?

I see the info on it now, you have to go to the zero's specifications to see that model.

Only experience with speedplay I have is the X-series and they are good pedals, just have to do maintenance on the cleats a whole lot more than with other pedals I currently use.

OP if you're using these for track purposes then they will work very well, much better than street shoes and cages as far as power transfer, if you're looking to use them for dual purposes like street riding as well then the cleats will be annoying to walk with.

I use shimano SPD with specialized mountain shoes that I can walk around in and doesn't make that clack noise like road cleats do. If I were to race my fixed though I would use a stiffer shoe like my road shoes but its totally up to you what choice you make in pedals depending on what you want to do with them.