This certainly is one of the most useful books I've read. I started my Ph.D 4 months ago, and this book helps me understand important aspects I need to do to have a successful Ph.D.
The book writes specifically for American education system, and by reading it, I understand why the U.S. produces the most brilliant scientists, and American universities are the envy of the world. Going through 4 to 5 years of devoting for contemplating and doing experiments, U.S. graduates certainly the experts in the field.
I have mixed feelings when doing my Ph.D. in France instead of in the U.S. I had my supervisors and research topic before my arrival here, and time is fixed for 3 years because of the scholarship I got. The requirements here are not really tough; I know some people who graduated from the doctoral school without any published paper. It seems to me that they finish the program when time is over. This kind of system prevents you from spending too much time in a graduate school, so it's kind of safe. However, being freely spending your time doing your research at your own paces, and being able to explore several research topics before choosing a final one are really interesting and helpful.