This book is essential reading for any Star Trek fan. Even if you may not be a big fan of TNG (I myself prefer DS9), this beautiful tribute will surely improve your understanding of the days before, during, and after the creation of TNG series.
The text is written in a very amiable, intimate and lively manner, obviously showing the authors' love and dedication to the TNG world. Content-wise, the book is utterly fascinating: there is everything from the stories behind the casting ("But he's bald!"), to the creation and incarnations of the spacecraft of the show, to interesting anecdotes both clever and funny, highlighting special episodes, audience reaction, notes on production; even clear and non-technical explanations of various financial aspects of producing TNG and the movies. Absolutely nothing comes across as overly technical.
The book is divided into chapters tracing each season and movie involving TNG cast; each "season" also includes episode-by-episode synopses by the side - very helpful not just as an episode guide, but as a way of guiding the reader throughout the TNG journey. In fact, one of the best things about this book is its strong sense of chronological unity - reading the book from front to back, you are surely and rapturously guided through the entire TNG history - it feels like getting to know an old friend anew.
The book is made even better by the tons of colour photos throughout - ranging from pictures of props to sets, to ships, production designs, cast, scenes, costumes, production... it's just fantastic.
A lot of intelligence and dedication has gone into producing this book. I really can't praise it enough except to say: now I admire Star Trek: The Next Generation even more.