One of the most important books for how successful it is in deconstructing gender, showing how women remain under totalitarianism even when politically "liberated", although it's so normalized that very few people notice it and many would think this book is dated even though it's just as applicable at present as ever before, if not more because of how hidden it all is. My only issue is with her idea of revolution, which is not nearly violent enough, but at least she leaves it open-ended for you to decide how to approach it yourself instead of giving the reader bad advice. People love to nitpick at minor flaws in anything feminist while praising works by men that are full of far more glaring flaws.