I ride Speedplay X2s, and while I'm happy with them and would recommend them, I say stick with the Keos if they're working for you and you're happy with them.
I like that my Speedplays are double sided, which makes clipping in a no-brainer. Also, they are super easy to unclip from.
A friend switched pedals (to Time I think) upon a recommendation and ended up with some major IT band problems.



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