Was it useful for you?
It was very useful, both in a personal and professional capacity, addressing the areas of emotional thoughts, feelings and behaviours.  This is however very much a self help book, rather than addressing business needs directly.

Is it well-written and informative?
It is very readable, with a little of the science, but not like some where you feel you are reading a psychology textbook.  There is some repetition, which if you read the book cover to cover is evident, however if you are picking it up a chapter at a time will provide a useful recap.
 
The books starts by explaining emotions, why we have them and the purpose they serve.  It then takes us through the journey of managing them via different techniques and also responding to and managing emotions in others.  There are some detailed examples which are most helpful.
 
There are some lovely quotes at key points, one of my favourites being “Emotions say hurry. Wisdom says wait” .. wise words indeed.

Who would you recommend it to?
Anybody with an interest in the subject of emotional intelligence, anyone who wants to understand their team or themselves better.  It helps to identify the areas of emotion, why we behave in that way and then gently guides us through the process of recognising it, coping with it and using it to our advantage.

What would you give it out of 10, with 10 being excellent and 1 being very poor?
9/10 it is a nice introduction to the subject, practical and easy to understand.