Note that there are two mode of operation. Online operation gives access to some detailed photomaps, as well as the downloaded raster mapping. Offline mode does not provide photomaps. Neither set of maps gives sufficient street level detail for navigation in the larger cities. For example, only major streets are named, and app does not permit sufficient magnification to be truly useful. Outside of cities, it probably has sufficient detail.
There are some alternative routes described on the CF, but not all the alternatives that I know of. For example, the river route into Burgos does not appear, and only one route is shown leaving Villafranca del Bierzo.
I was unable to test how well it used the GPS on my tablet.
Nice, particularly the wonderful topographic maps at the higher levels of detail. But not good enough where it counts most, and that is having good detail for city navigation. Products like OSM+ demonstrate what can be done with good vector mapping, and are much better in those circumstances than this.