I've been reading by and about Wittgenstein for the last 4 or 5 years and recently came across this book. I believe I would have been spared a great amount of misunderstandings had I known Hacker's book earlier.
Although - as the title suggests - it is a general overview of Wittgenstein's thought, it gives a very clear if brief idea of all important issues and makes you understand his position as compared to many other great philosophers inside and outside Analytic Philosophy.
It also gives a brief overview of the development of Analytic Philosophy, its main contributors and their point of view on many decisive issues.
My thanks to Prof. Hacker for writing this great work.