The book depicts modern day society by comparing it to a fictional world that is dystopian to some and utopian to others. Written 80+ years ago, it has aged extremely well. It deals with one of the fundamental questions that humans in 21st century are facing; "what do we want to want?", "what do humans want to become when we can achieve anything through technology?", "what is happiness to humans, is it the pleasure after suffering or can it be resolved with tweaking your brain!".
The book gets a little boring midway because of the writing but it picks up after that, so don't drop it.