I don't like it, but it is sadly inevitable in some form.
If they can get it down to less than a minute &, crucially, add screens in all grounds that show what the VAR ref's are viewing in real time, along with an on-screen announcement of the decision, it'll be a bit better.
It'll never work completely though, cos as I pointed out at one point last night, Firmino was taken down by their keeper, which TBH was a very hard call to make even on a replay, but the game played on, as it did so, & the ball was around the halfway line it became clear that it was under review & a few seconds later it was deemed no decision was to be made on it.
However, had that been called a penalty, & West Brom had countered quickly what the fuck would have happened? They could be either celebrating a goal or about to shoot when he's being told there's a penalty at the other end!
Unlike in cricket & tennis, there is not necessarily a natural break in the game, so the inevitable conclusion is that as soon as the VAR ref decides to review a decision the game must be stopped, immediately, regardless of where the ball is, which means there will be a few wholly unnecessary breaks.
Again, having a screen showing the fans at the game & at home what is being contested & the decision in real time will help from a fans perspective, but it'll still adversely effect atmosphere (waiting for fuck knows how long before you celebrate a goal? fuck off) & momentum.
The World Cup will be a fucking nightmare, as they always insist in using referee's from all over the world, & as we know, the best referee in a lot of countries is still fucking shite. This system combined with shitty ref's will be horrific.