We just came back from spending a week in Washington, DC. Again, of all the books and maps we brought, this was the only one that we kept using day after day.
The guide is small and easily fits inside a purse, coat pocket, or backpack. We love the detailed maps that flip open and easily folded back into the book. We also liked the format of the book, which breaks down the city into manageable and detailed sections. There are descriptions and pictures of the main sights on the map page so we always knew what to see in the area where we were at. On the other side of the maps, there are places to eat, places to shop, and other activities that are nearby which proves to be a handy reference. It makes it so we don't have to carry both a map and a guidebook.
This mapguide makes it easy for us to see a lot of sights in a short period of time. Our friends always ask us how we see so much in a short time and we tell them it is with the help of this guide! What was funny was when we had this out, other travelers asked us where we purchased the guide because they wanted one too.