Decent Summary
I've done a lot of work with MBPTI over the years so I know a lot of what is said about my personality type (INTJ). I've found it helpful over the years, especially in terms of my work life, to be able to play to my strengths and be aware of my tendencies as well as areas I need to catch myself and open up to other ways of being.
There were few surprises, therefore, in this book for me, but a good refresher about areas I need to be aware of as I continue in my career. It is not, however, an in-depth examination and does focus more on the positive rather than the downsides. If you're new to MBPT, these books (one on each type) can be helpful overviews. They're also good if you know the MBPT of coworkers or loved ones--they may give you helpful insights into how to be in relationship in better ways. However, do remember that no one is a "perfect example" of their personality type. They're simply tendencies. Take them as descriptive, not prescriptive.