One thing the video doesn’t showcase is that the application makes use of the built-in compass, GPS and gyroscope. This lets you simply point your device anywhere and get a picture-perfect representation of what astronomical objects are in your field of vision as well as get all the details you could want about them.
At $2.99 for such a complete app, I think it’s a very good deal and entirely worth the expense.
Copernicus would be stoked. :)