I bought this in advance of a trip to Madrid, and it appears to have everything I could need.
There's a map of the metro, several pages of city maps (only the city centre, but I won't need much else) and then lots of pages for notes and scribbles. The notes pages are broken down by tabs, with seperate sections for food, drink, hotels, sights, etc, and a number of blank tabs so you can make your own dedicated sections. There's also a healthy number of blank pages, a section for names/addresses, a handy block of tracing paper, and a document pocket at the back for business cards and whatnot.
I think the real value in this will come from years of shared use with friends and family, as it's the perfect tome to build up your own travel guide. I'd happily shell out for the other city versions if/when I visit those places.