I have not read Heider's original work on the Dani tribe, but this book gives a very good sense of how things changed in their culture. It creates some interesting pictures of their tribal society, particularly in the mindful way their camps are set up, how they farm, their spiritual culture (particularly in their vision of what the dead do in the afterlife), and the horrible revenge-killing process of their culture that puts them in constant conflict with opposing tribes. It's not the smoothest writing, and sometimes gets sticky or too technical, but most of it is sufficiently self-contained and interesting.