I've purchased a dozen military novels and resource manuals on both the ancient Roman and Greek militaries and I have to say that this book has been the best one in my library.
If you're a historian buff, school student, reenactor, or just out to learn more about the Roman's armor, weapons, shields, etc... this is THE book for you.
The layout starts by discussing the different evidence found and then jumps into the various periods of the Roman civilization. You get to see the advancement of the weapons, armor, structure as it morphed over centuries. Each point added is backed up by actual evidence found in digs throughout Europe and the Middle East. You get to see the items as they were when they were taken out of the ground in all their glory and learn all the necessary characteristics about them.
I can't begin to explain how great of a reference this is. I had never read the original printing (my copy is the re-print) but it came highly recommended to me as I want to get into Roman reenacting. If asked by anyone else, this would be the book that should be at the top of anyones list.
While I think each individual section could have been longer with more examples... I still think it's one of the best out there. Don't let the pricetag push you away from purchasing it. It should be on the shelf of anyone interested in the Roman civilization.