This is one of the most useful books that I have ever read, and shared with pupils of mine.
For an amateur player, say 1900-2000, who has problem to deal with the technical aspect of chess (mainly how to convert an advantage in a win) it should be a must.
For the trainers, it is also a superb material, that will help you to work on common deficiencies, just by showing the games and asking: "What do you play next ?".
Ulf Anderson was a dry and technical player, who used to exchange queens, and some other pieces, as soon as the opening, so that to be able to enter directly the ending, which he played masterfully.
The material is great, and the authors did a beautiful job with it, in order to give mostly short and accurate verbal comments and selecting some turning points in each game, giving a diagram, and asking a simple question to the reader.