Well, it's a dictionary. Far as I can tell, it's a good selection of words (though heck if I'm reading it front-to-back), though I can't imagine it being more helpful than having internet and just searching for whatever word you need (what I always do).
Granted, an acquaintance at a birthday party recently noted that paper books are still popular with the younger readers (fantastic!), since books tend to be the go-to when "screen time" is over. It's definitely helpful for the precocious types who won't have internet handy!