This is probably the best math book I've ever read. Unlike other stuffy books, this one is very personable and informal. It is extremely readable, the explanations are crystal-clear and very intuitive and well-motivated, plus the author inserts a lot of humor (it's so nice to be reminded that mathematicians are humans). There are fascinating examples culled from applications.
I should note two things. First, it is not a proof-based book. It discuesses the cool theorems and gives intuitive justifications, but the author is clear that his goal is to build intuition and give experience with the techniques, rather than mathematical rigor (thankfully, he is honest about this and points to areas where more rigor could be introduced, rather than giving the unnatural and awkward hybrid of rigor and intuition attempted by many calculus books). Second, a lot of the problems (though certainly not all) deal with pathological and/or special cases, so it's possible for teachers to give fairly onerous homeworks.

An excellent study on nonlinear dynamics. I hope this book will provide a major support to the students and researchers who are interested in nonlinear world and chaos.

The book came just in time. This book is used for school and recommended by faculty.

This is a fantastic book on dynamics. It takes the intuitive path to understanding dynamical systems and skips the formally ladden historical precedent. I've enjoyed every word I've read and can honestly say that it has improved my intuitions for dynamical systems ten-fold.