After installing Cortana, you'll have to run through a quick setup process that includes agreeing to the terms and telling Cortana your name. You can also sign into your
Microsoft account, assuming you have one. The app has a few
Google Now-ish features with weather, news, and local destination cards. The voice features are the real selling point, though.
You can have Cortana do things like place calls, look up directions, and set calendar events just by talking. The app seems to recognize words with high accuracy and it's very snappy. Cortana is also quite good at chaining together multiple commands. For example, if you do a search for a restaurant, you can then ask it for a map or directions by saying things like, "show me a map of the second one."