My favorite aspect of the book is the way in which it depicts “addiction” in its many forms such as being addicted to drugs, playing sports, consumer products or work. It makes you think hard about the elusive nature of happiness and fulfillment.
That was my primary takeaway as well. Some people I've talked to about it didn't quite get that theme from it, but I think it helps frame its point in a less scattershot way. It is still a concept I constantly think about, though it doesn't help me avoid the pitfalls much, which I think is also kind of the point.