It seemed to work fine in the UFL for measuring whether the spot was a first down or not. Even with the microchip in the nose of the UFL football, they still didn't always get the spot right due to difficulties seeing when a body part went down and where the ball was at that instant due to all the bodies in the way.

So, this might speed up the game a little by not having to trot out the "chain gang", but fans can't expect much in the way of accuracy of where the ball is spotted at the end of the play.