I don't like it because it makes players, managers and fans fools for celebrating and then the goal won't be given. It takes the drama out of football.
There's was definitely drama in the CL SF with the City disallowed goal!
They need to concentrate on quick decisions, like our penalty in the CL final, it was quick decision, so worked ok.
I'm waiting for it to be say a penalty decision, the ball is cleared quickly and the opposition score, does the ref then pull it back to the original penalty decision and disallow the goal scored subsequently?
The APP stuff sounds silly, grounds have awful wifi.