It felt a bit mad, reading a dictionary from cover to cover, but I have no regrets now that it's finished. Despite being 40 years old, the focus on thought keeps the discussion fresh even from a couple of decades' distance. Of course there are interesting bits, where just six years before the collapse of the Soviet Union, none of the authors seemed to consider that a realistic scenario. But mostly the book provides a comprehensive glimpse into different traditions of Marxist thought and their sometimes frayed connections with the founders.