You should spend some time on the Speedplay site.
I have ridden both X series and Zeros for years. If the Zero cleats are installed badly, it's possible for the cleat attaching screws to come out. Loctite and a little awareness are all that's really necessary.
That said, the X series are easier in and out if you think a free float will work for you (works for lots of people, depends on your knees and your desire to maximize your speed - free float trades off greater knee comfort for a little bit of efficiency in my opinion).
Brand new easy action Zeros were introduced at a trade show recently - those sound interesting.
Great pedals, two-sided entry is great, all pedals need a week or two to get used to, small platform means nothing. No other pedal is as good as Speedplay, IMO.
-------------------- "You never make a gift of Ventoux"
Eddie Merckx to Lance Armstrong
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