I would recommend this book without hesitation for anyone wishing to get a introductory grounding in Lacan, and post-Freudian psychoanalysis more generally. Sean Homer makes it clear that his task is not to act as an apologist for Lacan against the arguments of neuro-biology, or what have you. (Although it would have been welcomed if he had dealt with criticisms a bit more thoroughly). Rather, he organizes an extremely efficient overview of Lacan's works, always beautifully situated in the philosophical contexts of continental philosophy from which Lacan drew his influences. Homer's writing throughout is an absolute gloss of clarity: his analogies and elucidations are very readable and concise. This book is far superior to the 'Lacan for Dummies' stuff that uses cartoons rather than careful explication. Homer proves that to talk about Lacan you need not be obtuse.
Obviously, you'll need to move on from here to enter into the fullness of Lacan's complexity: the labyrinthine textures of his theory are well known. Homer doesn't shirk from that -- indeed, he does well to explain how, like Joyce, the maze is part of the affective impact. And Homer provides a brief, but well-annotated, list of more in-depth studies.
I suppose the one tiny criticism I would have is that this book heavily favours Lacan as a theorist in the humanities -- which is no surprise, considering this is one area of the university he thrives. Still, it tends to prop up the initial accusations, which Homer relates via a Times Lit Sup review, that Lacan endures only because the eggheads in English Lit departments are willing to tend an obsolete flame. There's more to it, obviously, but Homer stays away from discussions of clinical applications, or other applications of Lacan's work besides those in hunt for tenure.
Still, I would stress without reservation that this is a fantastic introduction, presented in an even tone presents an overview of Lacan, in prose whose poise and precision are admirable and accessible.
Well done.