I found it overall fairly good but as far as intelligence went, almost hopelessly outdated, both in its ideas about what increased intelligence would look like and its effects on society - when was the last time you saw an elevator operator? (Especially the obsession with new natural languages as a feature of greater intelligence; but see my review of Malinovsky for more discussion of that: https://www.goodreads.com/review/show/985511206 ) A few bits made me face-fault too - like how he took a perfectly good solution to the Fermi Paradox and then casually screwed it up by mentioning other starfaring civilizations.