This is one of the best books I've read. Heidegger does not allow himself to fall into a commonality of thought. He favors originality and consistency, and he dares go beyond the available material.
I have a pretty negative impression of this book. I haven't read the whole thing but I have studied one section in depth, one-on-one with a professor. I have also read secondary sources on it. This was so I could write a thesis on another philosopher to whom Heidegger was an important influence (...