These deluxe editions are definitely the way to go, presenting the story on large, high-quality pages, tightly bound in a dust-jacketed hardcover. Not only are they the best way to read the story, they also make a great-looking collection (unlike the standard paperback editions). Besides that, each of these deluxe editions includes never-before-seen bonus material, the written script for one scene of the series in this case.
Volume 4 includes the stories from the Paper Dolls and Kimono Dragons paperbacks, meaning we're 4/5 through the entire series after this one. This volume is what puts the 'epic' in Yorick's epic journey around the world, as we find him in Australia, Japan, and China. A lot of back-story is included here, as we learn about Dr. Mann's, 355's, and Alter's troubled pasts, as well as the secret history behind Ampersand. Clues about the origin of the plague are popping up, though there is still much shrouded in mystery. The top-notch storytelling we've experienced throughout the series continues on, and Yorick and Co.'s story is just as exciting as ever. I particularly enjoyed Yorick's adventures in Japan, as we learn more about how that culture has coped with the loss of all the men.
Needless to say, I look forward to the final deluxe edition, which is sure to finish off this exciting story with a bang. Highly recommended!