Actually a fantastic app...
…but it doesn’t work as it originally did on pre-iPhone 6/6+ phones (though it work on the iPad Air 2 *shrug*).
So, until the maps work in iPhone 6s and 6+s, it gets one star.
If you read the 5 star ratings, they’ll tell you what the app was in its full glory.
BillTotman about
Exit Strategy NYC Subway Map, v2.5