Yes, I can't recommend this book enough. Throughout my career, I've come into contact with a number of consultants from Harvard/MIT, Bain, McKinsey, etc. They all had a way of communicating ideas so clearly and effectively that I could understand exactly what they were saying, almost immediately. There was virtually no loss of information between what they spoke and what I heard. The ideas and thoughts all just flowed into my brain painlessly. I aspired to communicate as well as these people, but I just couldn't figure out the formula.

Finally, one late night, sitting across from my managing director (the leader of a prestigious boutique pharma-consulting firm), I asked him rather bluntly, "How did you learn to speak so well?" He gave me a rather blank stare, and thought for a little while. "Ah!" he exclaimed, jumping up from his desk and darting over to his bookcase. After a little rummaging, lo and behold, he pulled out an old copy of the Pyramid Principle. I leafed through the book and found a number of notes and highlights as he explained to me that what I held was the single most influential book he'd ever read. He told me to read it, not as a way to structure presentations or emails (although it helps there), but as a new lifestyle. Fold the ideas and principles into your very being, so as to become second nature, and you'll never have trouble communicating again.

It's a must-read book.