I don't find Google Now very useful...yet. I don't really need the directions/ETA to work, or home most of the time. I don't really need the sports scores on there. It's nice to know when the local sports teams are playing, but I don't need that, either.
I am expecting it to grow, though. The foundation has been laid, and so far it looks pretty damn good.
Side note - I love the google voice search. Pretty, easy to use, accurate, and fast.