I am not adequately trained to discuss poststructuralism (or any philosophical idea.) But that is one reason that I like these Very Short Introduction books. They give an introduction to the concept so that you have a broad idea of the concept, which allows you to pursue it more fully later (or not.)
Like most of these books, the main content is about 150 pages. I listened to this on audiobook, which may not have been the best choice, but it is what I had. I did not realize when I picked it up that a new edition had been published. In something as recent as Poststructuralism, the 20-year-old 1st edition was likely dated in ways I do not understand.
The second edition has an additional chapter, and chapter 2 is expanded and chapter 3 is restructured or retitled. Overall I feel like I have a helpful introduction to the subject, but I would not attempt to try to really write about my understanding or evaluate how well the author did in the presentation. The content seemed to be clear, and there was some good humor, but that is as far as I feel like I can go.