We've got the Maxi Cosi Complete Air for our three year old DD and the head rest and positioning of the straps can be easily adjusted without taking the seat out of the car. I actually adjusted it with DD in the seat the other day! I wonder if that's the difference between the seats you've mentioned?
I think the adjustable one is considerably taller too. We went in and saw them and apart from being adjustable so super easy to get harness at right height the head rest goes almost as high as hi liner. We are getting two of them
The easy adjust is the new model just released in November......it is 8cm taller and has the auto adjusting straps. The maxi rider ahr is the old model being phased out.
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