How much float do the Speedplay Zero pedals have?
I read the following, from their website as having the option to either lock them in place and use them as a fixed cleat, or use them with up to 15º of adjustable float, which considering many are only about 7º seems like a lot. 


  By thinking "outside the box", we created and patented the most
  technically advanced pedal system ever, featuring your choice of
  either a fixed position or up to 15 degrees of micro-adjustable float


I personally have no experience with them though, Nor have i heard much about them, that is just how i interpreted it.