I think the sub-title is a little misleading "the international guide to the last underground scene". Its not a guide to the underground scene at all, it is simply a Band Directory, and Mick Mercer says as much in his introduction.
The book has a comprehensive listing of bands from all over the world. You may notice omissions, but there always are in any piece of work of this magnitude. The book is a little over 600 pages, not the 700 listed in the product spec.
The format of band listings is as follows:
Some entries also have brief biographies or interesting comment.
I think the cover/sales description should make more of the inclusion of a basic discography for each band, its a valuable resource.
If the music rather than the "scene" is your passion then this is a great book to have in your possession. If you are looking for comment on the culture, the "scene" then this isn't what you are looking for. I love it. Its a valuable reference work and will provides hours of interest for a music collector such as myself.