I read this quite a while ago, and it is still a book I recommend to my friends. This is the only book in Simon Critchley's "How to Read" series, but, on the basis of this book and its series introduction, I think the goal of the series is fantastic. To be clear, by "how to read," the intention is not to tell the reader how to interpret the author and his texts. Instead, the series is intended to develop a contextual understanding of the author's works, contextualize it historically (supplying relevant social influences, etc), and sewing it into the author's biography (so that the intentions behind the works is understood). In particular with Kierkegaard, there is quite a bit Kierkegaard in his philosophy, and I might even go so far to say that he was his philosophy; so understanding the reason for the pseudonyms, for example, require understanding a little about Kierkegaard as a person and his motivations. Critchley points out that one of the intentions of the series is, not to give some basic information about the texts (a rushed summary) or a canned biography, but to supply pieces of text that are stitched together with insights, biography, historical context. I think this is probably the best part of "How to Read Kierkegaard": the excerpts are so wonderfully chosen, and the commentary and insight so good, that I felt like the 100-page text was as saturated as a 250-page text, yet wholly accessible to the newcomer. My personal favorite aspect of this work is that the really obscure texts (there are a lot with Kierkegaard, because he wrote voluminously) and helps the reader understand the major works in light of them, where it is valuable to do so. Caputo really does a great job of referring to, for example, Kierkegaard's thesis on Socratic irony, for example.
I have spoken with a number of younger readers (not all philosophy majors), who are apprehensive about looking into Kierkegaard because of the religious nature of his writings, and I think this is the PERFECT text to see whether one should choose to read Kierkegaard. For those interested in Nietzsche, I say reading Kierkegaard is a must, so I recommend reading the Kierkegaard selections from Nathan Oaklander's "Existentialist Philosophy: An Introduction," at the bare minimum. Still this book is recommendable to those Nietzshce fans, as well as anyone with a little extra time who has already read some Kierkegaard; but I especially recommend it to those who maybe either want a tiny taste of Kierkegaard, at a low time-cost, and those who want to test the waters. This book is also great for figuring out where to start with Kierkegaard's texts, if you have already decided to read him, but don't know where to begin.