If you already have an understanding of the DC Metro system, meaning you know where to enter and exit, this app is no better than a paper map you can get for free at any Metro stop. You search for the Metro stops that you want to use and this app simply tells you the route. Would be worth the price if the user could input starting and ending addresses (door to door) and the app gives the stops to use and the walking route, if needed. Better off using the WMATA mobile site (which is free), it gives you every thing this app has to offer, plus a real "door to door" trip planner.
MGardiner49r about Washington Metro