From the reviews:
"The author of this book has done a great service to the geometric group theory community by writing a very useful and well-written book on many topics in geometric group theory that every neophyte and researcher in the field should know. This book is suitable as a textbook for a graduate course, with many good examples and exercises. The reviewer highly recommends this book as a basic reference book for topological methods in group theory." (John G. Ratcliffe, Mathematical Reviews, Issue 2008 j)
"This is an interesting book on the interplay between algebraic topology and the theory of infinite discrete groups written for graduate students and group theorists who need to learn more in geometric and homological group theory. It is a beautiful text in algebraic topology, with modern topics and which points the reader towards new research directions." (Corina Mohorianu, Zentralblatt MATH, Vol. 1142, 2008)
This book is an invaluable resource for anyone wanting a deep understanding of topics related to the ends of groups. there is a good deal of material in this book that does not appear anywhere else in the literature. Geoghegans book provides a well-presented, concrete development of geometric group theory focused on a topological approach. (John Meier, Bulletin of the American Mathematical Society, July, 2012)