I think they are saying to they want to go from 96% correct for Elite Group refs to 98% correct with VAR. Is that 2% worth the level of change in the game?
For the technology to work it has to be quick/seamless. The delays to the game of 2mins for the ruled out West Brom goal, and 4mins for the Liverpool penalty (according to read sources, I haven't taken a stopwatch to it) are far far too long (especially as 6 mins weren't added on).
The communication also has to be better. Whoever thought that the referee putting his finger to his ear was good enough in a 50000+ capacity stadium is clearly an idiot. Then to make a small rectangle motion before running off seems pointless. Then for there to be no explanation of what has gone on (especially after such a delay) and why the decision has been made is very strange. Its as annoying as referees not being allowed to say publicly why a decision has been made after the game.
Edit: though of course we now get a non-VAR game (Cardiff v Man City) with the ref & linesman taking an age having a chat about a decision, and then getting it wrong (Silva shot ruled out for offside against Sane).