Clearly written and interesting, it is a good introduction to CW's ideas, though we at libcom.org would have several important disagreements with it. Notably on the issues of class and nationalism
The book describes a three-class model of society - ruling, working and middle classes. It directs large amounts of vitriol at the "middle class" of which it fails provide an adequately description. It in fact defines large amounts of the working class as being part of the middle, but then tries to put sections of the "middle class" - by their own definition - into the "working class" so that their classifications do not look silly. For example, nurses and soldiers it correctly places in the working class, but by their definitions they would be part of the middle class.
In fact the book blends its attempt at a technical description with the more widely-used cultural description, but at one point it basically points out the fact that the "middle" and working class are essentially the same: that people from either group can either act for or against the interests of working people:
With all we have said so far you might think we hate all middle class people. Not so. Their class has a history of producing courageous fighters against oppression that they can be well proud of. While there is much that is distasteful about the activities of the middle class as a whole we recognise the fact that before and during a revolution the middle class will split and part of it will side with our class. Just as we know that the working class will split during a revolution and part of it will side with the bosses.
... though this is quickly forgotten.
It also shows support for "national liberation" struggles, which as internationalists we do not. Other texts in our library deal with this question.