To me, absolutely, but it depends on your interest area and expertise/writing level. I would say that this book would be more valuable to an entrepreneur who actively communicates with customers or investors, or performs marketing activities. It is less relevant to, say, someone who is interested in politics. It has plenty of examples of crafty word twisting from politicians, but it is not a book about politics, which I think disappointed some of those Amazon reviewers.

I am a fairly beginning app developer and wanted to learn more about copywriting and communication. After reading this book I looked over my past e-mails to customers and realized that my sentences were either outright confusing or communicated that my software is buggy.

One take on the message: you must understand your audience well enough to adjust your words to the most common denominator. Otherwise, people will misunderstand your message and it will confuse or backfire.