It's a very good book.  Emms takes a lot of space to explain various themes and plans in each variation.  I think the combination of this book and "Mastering the Nimzo Indian" would give a player an extremely thorough understanding of the various structures and middlegame plans.  I also like the recent "Chess Explained" book on the Nimzo.  People often say they want opening books that explain ideas rather than just giving endless variations.  However, some openings lend themselves much better to explanation than others.  For example, explaining the ideas behind the Evans Gambit or Max Lange Attack is relatively useless if one tactical shot destroys your whole position.  The Nimzo, however, lends itself nicely  to explanation.  Studying the Nimzo also strengthens your chess understanding in general.  

Just my two cents,
Scott

Quote:

I have it and it and this little book is one of my favourites in the series and one of my favourite authors too. The repertoire is very nice and in my view more for positional players. There is an explanation of the themes in the beginning of each chapter. It is from 1998 and a bit dated now but everyone can do creative work or follow chesspublishing! 

4.Qc2 - 0-0
4.e3 - b6
4.a3 - Bxc3 5.bxc3 c5
4.f3 - d5 5.a3 Bxc3 bxc3 c5
4.Cf3 - b6 5.Db3 c5! 
               5.Bg5 Bb7 
4.Bg5 - c5 5.d5 d6 6.e3 Bxc3+ 7.bxc3 De7
4.Db3 - c5
4.g3 - 0-0 5.Bg2 d5
4.Bd2 - c5
          d5