Anybody used this on their smartphone?

I downloaded it yesterday and have just got back from a run and it seems very good.

I guess it is similar in a way to the Nike Plus program although I never used that.

Just a heads up for people to try it

Does this actually talk to you as you run? Saw the advert on tv with that pretty catchy song but couldn't quite grasp how it worked?

Or does it just monitor your performance and give you post run graphs and all that?