I saw it last week and really liked it. I won't say too much as I don't want to give away any spoilers - although there isn't much action, it's all character-driven. Ethan Hawke in particular is very good. I enjoyed the parents' stories more than the child's.
I'm intrigued by the glowing reviews in the Dutch press and in the Guardian. But at the same time it's a bit of a tear jerker gimmick to follow a child for that time. And the trailer smacks of Buzzfeed click bait levels of pandering...
Still; I'll go see it. If only because of Linklaters record.
Of course the rise and development of a child is touching and feel good. Made me wonder about filming and tracking the reverse; seeing people age, grow wrinkles, become less lithe. Might not be so feel good perhaps.