Well, honestly, when I first read the idea, it was a big “meh” for me. Then I showed the video to my wife and kids. The 14 year old dismissed it out of hand. The 12 year old and 9 year old immediately asked for one, and that caused the wife to ask for one too. I should say, all three have smart phones. So, why do they want one?
My 12 year old is a particularly rough boy. He’s in the woods, up trees, crossing streams, riding bikes, throwing himself to the ground etc. He regularly gets in trouble when we can’t reach him and the reason we can’t? Because the phone is far off to the side for fear of breaking the screen or otherwise damaging it. He LOVES the idea of having this in his pocket and ceasing to get in trouble for being unreachable.
My 9 year old on the other hand is the girliest of girlie girls. She hates carrying her smartphone. Not because she’s afraid of damage, but because she rarely has pockets big enough to hold it, and finds it annoying.
The wife then wants it for the ease of having it with her wherever she goes to reach the kids’ units.
TL;DR: In my family these will NOT be smartphone replacements, but rather will address use cases where the smartphone simply is sub-optimal.