If you think that people can be categorised into personality types, then you will find this book informative.
Me? I'm not sure people can be so easily put in a box like that. For example, I may be a peaple pleaser in some situations, or with some people, or because of the project I am working on; at other times,I may not be a people pleaser and be willing to stand up and argue for my opinions on a piece of work.
This book encourages you to place your colleagues, (and yourself) in a box, so you can predict behaviour. That works sometimes, but we should always bear in mind that personality types are much more fluid than we realise - so put a colleague in a box, but leave the lid open as they might move to another in different circumstances or with different people!
Having said all that, it's an interesting and thought-provoking read that will open your eyes to your colleagues behaviour.