I don't know but it is well worth the investment. In some ways, it is even better than listening to the game on radio because in some cases the announcers suck so bad that it can be difficult to enjoy the flow of the game. With the live data, you get a sense of not only how the game is moving but who is doing what. Is it instant gratification for data junkies like myself.
I'm with you RiderRaver. I love listening to my Boston Celtics games while following the game on the CBSsportsline Gamecenter. (I'm too cheap to buy the NBA Live Package!) It's a great way to follow the game. You feel like a coach on the bench being able to keep track of the statistical trends on the game and to question the coach's decisionmaking.