I'd say it is a necessary read for anyone who is interested in advancing their career either within an organization or independently. The advice offered in the book isn't difficult to implement, it is essentially common sense and manners. I've read the book about a half dozen times and with each read I gain a little more insight into how to conduct myself professionally.
I'd recommend it as a general life-skills sort of book, which can also be applied toward career success in sales or management. If you don't want to read it, just find the summary online, apply it, and see if your life changes. It's harder to implement than it sounds, at least in my experience.