There's a lot of interesting material in this volume, such as Contribution to the Critique of Hegel's Philosophy of Law, On the Jewish Question, and Engels's articles written for the Owenite newspaper New Moral World. But what drew me to it was the Economic and Philosophic Manuscripts of 1844, particularly the last twenty pages under the heading Critique of the Hegelian Dialectic and Philosophy As a Whole. This one moved to the top of my list after reading Lukacs's History and Class Consciousness: Studies in Marxist Dialectics, concerning why it caused him to renounce his own work when it was published in 1932.
The Hegelian Dialectic section was unfinished, but still Marx clearly spelled out the negatives and positives of Hegel's conception— this is where he stood Hegel on his feet. Since History and Class Consciousness, published in 1923, had a more speculative nature while exploring the same territory (nothing definitive had been published on Marx's methodology until then), and considering Marx's hard, anti-speculative stance on materialism, I can see where Lukacs might want to reexamine his work. But clearly politics was the issue—Lukacs's book might have missed some essential points of view, as would be expected while trying to suss out such unstated premises. But in my opinion the contextual value of Lukacs's book clearly overshadows such incorrect assumptions. It's hard to see how politics wouldn't be the dominant factor here.
At any rate, this was my first foray into the Collected Works, and in the end it presented me with a problem. With its abundance of letters, newspaper articles, unfinished manuscripts, and reading notes, this book contains a wealth of context for the historical period which produced Marx, Engels, and the Communist movement they came to shape. The problem is, I just want to move to the next volume and keep going; how am I going to get through the rest of my reading stack under these conditions?