I bought this for a recent holiday in Marche. This guide is very poor for the area. It has an interesting introduction to the area, then about 75% of the remaining book is about Umbria, with Marche being restricted to a few pages.
The opening times for the Urbs Salvia roman site was incorrect - in the winter the site is only open on Saturdays and holidays, not every day as the guide suggests.
The other problem with the guide is although it has pretty, full colour pictures, you really get no sense of what the place is like, or whether you would actually want to visit it.
There are too few maps of towns. The map of the area is not detailed enough to be of any sort of when driving or even working out routes.