I used X-2 for years and then switched to light action back in 2010 or so. I find them VERY easy to unclip and yet, I've never accidentally unclipped. You have to rotate your foot pretty far, but it's not hard.

The float is really not adjustable on either model but is on the Zeros if that's important to you.

I have recently switched to Look Keo and find the experience to be more pleasant on long rides... but clipping in is no longer the stab and go experience I enjoyed with speedplay.