I would concur with the previous reviewer that while this is a worthy re-issue the collection Philosophy and the Spontaneous Philosophy of the Scientists includes one of Althusser's most important works (and, more importantly, is much more difficult to find second-hand) and should have been re-issued before this one. As I have all of Althusser's work in English my own concern is to have more translations done, but it's always good to have old translations reprinted for new readers. 'Elements of Self-Criticism' is perhaps the most urgent of all of those, although you can find all of the pre-1990 translations on the web if you can use a search engine. However, the importance of the short book (Althusser's first book, from 1959) on Montesquieu and the essay on Rousseau should be recognised. As G.M. Goshgarian has pointed out in his introduction to the most recent Verso collection (Philosophy of the Encounter: Late Writings, 1978-1987) those two writings definitely represent a thread within Althusser's work which came to the fore in the late writings, and a thread that was also there (if not seen by most readers) alongside other tendencies within Reading Capital and For Marx.
The essay on Marx and Hegel is a minor text, but well worth reading, especially alongside Lecourt's essay on the same theme (translated in the final issue of Theoretical Practice - now that's hard to find!) and the essay on Lenin and Hegel (available in the Monthly Review Press publication Lenin and Philosophy).
While many would have bought this second-hand while it was out-of-print all of those years, it is good to have this collection available for those who are only discovering Althusser now following the publication of Machiavelli and Us, Philosophy of the Encounter, and other "posthumous" texts.
Now if Verso would only provide a translation of "On Reproduction" ...