Im glad to read this review, because I have the older Vanguard (18)version of the book, and apart from the cut-away drawing on the front cover, there doesn´t appear to be much difference. I compared my book to the sample pages shown in the review, and everything is the same except the layout.
In the newer version, the photographs have the narrative text to their side, reducing the size of the photographs. The older book has them below, therefore the images appear to be much larger. Text and contents-order appear to be identical. The newer book appears to have an "layed-out order" and list of contents, but reduces the photograph size to accomodate this.
I would agree with Delberts review. Probably not 100% geared towards the modeller, but still useful. I picked up the older book from E-bay for a few pounds. With the amount of details on some of the new PIV kits, it could still be very helpful though, with parts placement and markings!.
Another book I have, and would be a much superior book, and definately better for modellers, is Tanks in Detail 1 - PzKpfwIV Ausf A to J, by Jonathon Forty. Some excellent detail photographs, and a helpful explanation of the changes between each ausf. It also contains line drawings, modern coloured photographs of preserved vehicles and 4 pages of tactical and division signs.