If you really want to know about the Battle of Gettysburg, pick the following authors: Trudeau, Coddington, and Sears--not Woodworth. They provide much more detail of the battle and give a much more complex perspective.
However, for those readers who want a short and to the point introduction to the battle, this book serves a useful purpose. Its brevity serves a positive function--even as it means that this cannot be a definitive book on the great battle. Key issues are described; the author writes well. There is not a whole lot here that is new; the standard anecdotes are retold--albeit nicely.
Still, for the Civil War novice who would like an accessible and easy read on Gettysburg, this book can do the trick.