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Running some xc4s and some older aliums at the moment.
Differences I can feel-
The bars on the xc4s are square, engagement feels slightly more 'clicked'
Running the tension at low or mid is interesting- very easy to exit the pedal but still feels very secure and (touch wood) so far haven't popped out unexpectedly.
Can't say I notice any more foot support from the wider pedal body which is strange- could be to do with the profile of my shoes though.
@swedeee, if you win them let me know how you get on with them. Been looking for some XC4's myself, be interested to know how they compare to older Atac's.