Excellent introduction from a man who clearly very well understands Wittgenstein and the significance of his thought. Hacker has used his understanding of Wittgenstein to criticise the conclusions of neuroscience elsewhere and has been very effective in doing so. In this book he does not waste any time on the tractatus and quite rightly since Wittgenstein rejected it himself in his later writings and who are we to argue with the greatest philosopher since Socrates.
If you're new to Wittgenstein, or indeed philosophy, this is a good place to start. This little book gives a bit of an idea of what Wittgenstein is about and is written in a very accessible way. I have recently read his famous 'Tractatus Logico-Philosophicus', which although a very interesting work of modern philosophy, it can be a very challenging read. However, this book is an excellent way to ease yourself into the mind-blowing and often baffling world of philosophy.