From the reviews:
"The book deals with the geometric theory of mathematical modeling, analysis, and control of ‘simple’ mechanical systems … . The text is written with great care and lucidity, includes many exercises, and has clearly benefited from being used in various undergraduate and graduate courses. The book will certainly become a main reference in this area … ." (A. J. van der Schaft, Mathematical Reviews, 2005h)
“Those who are interested in robotic mechanical systems will almost certainly enjoy reading this book. … intended to be used both as a textbook for graduate students, and at the same time as background material for researchers active in the field of geometric control theory or geometric mechanics. … authors provide an efficient geometric model for modeling mechanical control systems is brilliant. Precisely this fact makes this book very pleasant to read. In my opinion, it will become a standard reference work in the subject.” (Bavo Langerock, Bulletin of the Belgian Mathematical Society, Vol. 15 (1), 2008)