Here are some comments about the GuideBooks:

One can always learn from others and this book is an incredible gift from Michael to all Mathematica users. Full comments on user group wiki

Given by Luc Barthelet, Electronic Arts

This massive work is the comprehensive and long-awaited guide to help scientists use Mathematica to solve problems as they arise naturally in applications - not just exercises contrived for students. The techniques explained here range from brilliant one-liners to sophisticated programs. I particularly appreciate the vast range of examples illustrating the many facets of Mathematica: making pictures, doing algebra, number-crunching....

Given by Sir Michael Berry, www.phy.bris.ac.uk/staff/berry_mv.html

The Mathematica GuideBooks provide a really substantial tour through the mathematical sciences, with many delightful side-trips. Anyone who takes the time to inspect them will come away much wiser about experimental mathematics, symbolic and numerical computation and much more. They make a compelling case for the future of computer-assisted mathematics.

Given by Jonathan Borwein, www.cs.dal.ca/~jborwein

Trott's Mathematica GuideBooks are the perfect supplement to The Mathematica Book by Wolfram. Any Mathematica user will benefit enormously either by reading them from cover to cover or as authoritative references.

Given by Steven M. Christensen, smc.vnet.net/Christensen.html

Time has now come when even the purest mathematician can no longer ignore the new power of computers and computer programing as a means of exploring and tackling mathematical reality. Michael Trott is a perfect guide to the art of getting the best out of this new tool. This book, by its superb level and quality, its sophistication and completeness, should play a major role in allowing a whole generation of mathematicians to understand and master the sophisticated use of computers for doing real mathematics.

Given by Alain Connes, www.alainconnes.org

Michael Trott's GuideBook series is a splendid achievement. Trott is not only a master of graphical presentation, he is also a keen mathematician. The Programming installment is a healthy and powerful mix of artistry and science.

Given by Richard E. Crandall, www.reed.edu/~crandall

Mathematica, a comprehensive tool for doing mathematics, is thoroughly infused with mathematical history. The graphic examples, which expose and illustrate features of Mathematica, are frequently classic artifacts of important discoveries and inventions. The Graphics GuideBook is an amazingly complete library of visual mathematics and programming techniques.

Given by Stewart Dickson, emsh.calarts.edu/~mathart/SPD_ref.html

There is a quality about the work that I find very difficult to describe. I don't mean to say that the work itself is cryptic,but rather that there are some special qualities I don't find in other Mathematica authors. Michael Trott has a unique vision of mathematics and physics, and Mathematica allows him to express this vision. Most books about Mathematica treat it as a useful tool. Michael Trott takes Mathematica and uses it as a complete medium of expression.

Given by David Fowler, www.unl.edu/tcweb/fowler/fowler.html

Mathematical computing offers us the opportunity to explore new ideas with immediate, accurate feedback. Michael Trott's inspiring book proves this idea over and over. The breadth of covered topics is staggering, and Trott wields the Mathematica language with elegance and confidence. The inclusion of all the source code means that readers can immediately experiment with and build upon his marvelous work.

Given by Andrew Glassner, www.glassner.com/

The most impressive thing about the GuideBooks is the large number of surprising and serious mathematical and scientific problems which are solved with Mathematica. Anyone who is not yet sure if Mathematica is the right tool for his area of science should check out this book.

Given by Andrzej Kozlowski, www.akikoz.net/~andrzej/

Michael Trott, as a Mathematica insider and guru, has written an impressive set of books that will prove invaluable. The motivated reader will be propelled well beyond average programming proficiency, to a superior understanding of Mathematica and a new ease in exploring its strengths.

Given by Silvio Levy, www.msri.org/people/staff/levy/

I had a look at the various chapters and I am amazed... You have made a superlative (and a titanic) work! I think your book will become a "best seller" among the manuals about Mathematica. It is the natural and perfect complement to the Wolfram's Mathematica Book.

Given by Domenico Minunni, University of Bari

The Mathematica GuideBooks are a tour de force - an encyclopedic treatment of computer programming, graphics, numerical computation and computer aided symbolic mathematics. Lucid descriptions, compelling illustrations and easy-to-follow source code empower the reader in each of the domains. Taken together the guidebooks form a comprehensive guide to harnessing the enormous power of Mathematica. Everyone who uses Mathematica in science, engineering, mathematics or even art, can benefit from this incredible series.

Given by Nathan P. Myhrvold, www.intellectualventures.com/bio.aspx?id=e26036be-aefc-4333-98da-822bb698318e

A mammoth, wonderfully illustrated compendium of technique and example, Trott's set of GuideBooks elucidates Mathematica's many capabilities, inspiring both expert and novice to compute, visualize, and create.

Given by Ivars Peterson, sivarspeterson.googlepages.com/

This book will be the ultimate in Mathematica guide books for mathematicians and those who use mathematics. The author's knowledge of the software is very deep, but that would not be worth much without an imagination. And that is where he excels.

Given by Stan Wagon, www.stanwagon.com

The Mathematica GuideBooks are true mathematical gems. Overflowing with beautiful results, extensive literature references, and stunning graphics, these books provide a fascinating glimpse into the power of computational mathematics. Michael Trott's expert knowledge of the Mathematica programming language make these books an indispensable reference to both novice and experienced Mathematica programmers, and his encyclopedic knowledge of math, physics, and the literature make these books a mathematical tour de force. I have no doubt that the GuideBooks will rapidly become among the most treasured books in the libraries of students, researchers, and math enthusiasts alike.

Given by Eric W. Weisstein, mathworld.wolfram.com