I lost my first copy of this book and liked it enough to get another, so I guess I must think it's pretty good.
The main topic is the robotic task of Simultaneous Localization and Mapping (SLAM) and all of the (various) subproblems therein. I find it does a very good job of explaining the basic approaches and their building blocks (e.g. Kalman filters, particle filters) and gives a good foundation for reading more recent work.