I don't think its there to predict the winner of a game and the margin to within a definite accuracy.
What I think it is trying to highlight is little things which happen in a game, changing the momentum of how the game is going. Taking all those stats we look at after the game and applying them in real time. Looking for sides playing the ball in the opposition half more and stuff, things which aren't always obvious to the observer during the game. Teams having back to back sets has a longer term effect than the outcome of those individual sets.
If its true that the scores are put into the system during the game then I'm very interested in it, and it looks quite good. Its been pretty close on both occassions.
I'd have been interested if they'd have had something similar during the England RU game
