I personally find http://en.wottactic.com/blitz to be a better resource for planning map strategies due to its comparative simplicity, interactive nature, and ability to have people view changes live, like Google Docs. However in terms of looking at maps in depth, this is definitely a quality resource. From what I can tell (user interface is a bit hard to understand at first) you can look at maps in very high detail, and can move it around using touch controls or even by tilting the device. One important thing that it renders is a 3D model so you can view elevations which are very important in planning strategies.
Awesome find, will be keeping this app for sure