Kind of a mirror image of 1984, maybe combined with Gattaca.
I liked this book, but towards the end the worldbuilding kind of fell apart and I
found myself nitpicking inconsistencies.
(Spoiler alert) Around the end of the book, one of the "World Controllers" is
describing to the main characters why the world needed to turn to genetic
engineering and a caste system. He describes the following scenarios that they tried
or considered: (1) the scenario where they automate everything, and they have no
more need for physical labor, and (2) the scenario where they stop genetically
sabotaging people so that they become mentally deficient (e.g., Epsilons and Deltas)
and instead only have people that they genetically modified to be intellectually
superior (i.e., Alphas).
He states that the first scenario wouldn't work because they need to have something
for the Epsilons and Deltas to do, otherwise they would just be a net drain on
society and become disruptive. He also states that the second scenario wouldn't
work, because then the Alphas would get into arguments about who needs to do the
menial factory work that is beneath them.
This false dichotomy is destroyed when you consider the case where they both
automate everything and also only create Alphas. There is basically no downside, and
this situation prevents both issues from the above scenarios.
The other issue I had with the given scenario is that they felt they needed to go so far to prevent unhappiness that they needed to hypnotically condition people against monogamy. Obviously if people do not want to practice monogamy that is up to them; but monogamy is kind of a state of nature for most humans, and to deny that with social and hypnotic conditioning is not a great solution. In general, the prevention of unhappiness (as it's phrased in the book) is taken past the point of diminishing marginal utility. They already cured all known diseases, and are able to ensure that everyone can be an "Alpha", physically and intellectually fit. With that alone, a good deal of unhappiness is wiped out. But once you get to dictating people's love lives, you go past the point of diminishing marginal utility and start making things worse. In the book, for example, one of the main characters (Bernard Marx) is actually made unhappy by the anti-monogamy situation, so there is a clear counterexample available for the so-called World Controllers to see.
So in general, the book was a quick and engaging read, but the sci-fi scenario left something to be desired.