The first two chapters of this book, on the facticity of life and the meaning of being, are very good, not in the least because of the detail given to the early Heidegger (before Being and Time). Trawny needs few words, and few complicated ones at that, to explain notoriously difficult and muddled Heideggerian concepts- with the exception of the ontological difference, the meaning and implications of which are still not wholly clear to me.
After these two central chapters, Trawny incisiveness falters when he discusses the history of being and the "Wesen der Technik".