They say absence makes the heart grow fonder - so is that the case with VAR after an FA Cup fourth round which saw a series of controversial decisions in the absence of the technology?
Leicester City, Birmingham and Chelsea were among the clubs rueing the absence of the technology, with VAR not being used in the FA Cup until the fifth round onwards.
Last week, the Premier League revealed data which appeared to show the accuracy is improving, stating there had been 13 VAR errors from 70 interventions this term, compared with 20 from 61 at the same stage last season.
The Premier League also claims 100 per cent of offside decisions in the top flight have been correct this season.
That will be of little comfort to Leicester supporters, who were convinced Harry Maguire was offside when he scored Man Utd's late winner to knock them out of the FA Cup on Friday. Birmingham fans, meanwhile, will point to a goal for Newcastle where the whole of the ball did not appear to go over the line, while Chelsea's appeals for handball at Brighton were unable to be examined.
Here, Sky Sports takes a look at the controversial decisions over the FA Cup round and how VAR may have intervened.
Maguire appears offside before scoring Man Utd's last-gasp winner
WHAT HAPPENED
Manchester United claimed a spot in the fifth round in controversial fashion. Maguire was the hero when he nodded in United's injury-time winner, but had VAR been in operation it would not have stood.
When Bruno Fernandes swung in his free-kick, Maguire was already a couple of yards deeper than any Leicester defender, but went undetected by both the linesman and the referee.
WHAT WAS SAID
United boss Ruben Amorim admitted after the game that his side's winning goal should not have stood.
"With VAR it was not a goal, and I think it's important to have because it's fair for the game," he said.
"It's really hard to lose one game in the last minute with an offside play, but we need and sometimes we deserve a little bit of luck."
A furious Ruud van Nistelrooy did not hold back in his scathing assessment of United's winner which he called "unacceptable".
"We were not defeated in Fergie time, we are defeated in offside time," the Leicester boss told ITV.
"VAR you have a couple of centimetres, a couple of inches. This was half a metre, clear in line. That's a hard one to take because the team deserved extra-time. Decisions like this, at our level, are hard to swallow.
"When you prepare the whole week for this game, reacting after the Everton, and the game has been decided on a clear and obvious mistake, that is unacceptable.
"It's unthinkable at this level and then you have nothing else to do."
Chelsea crash out after 'clear' handball from Lamptey
WHAT HAPPENED
Chelsea crashed out of the FA Cup following a 2-1 defeat to fellow Premier League side Brighton, but Kaoru Mitoma's winner was clouded by controversy.
Georginio Rutter netted the equaliser after Cole Palmer had forced an error from Seagulls goalkeeper Bart Verbruggen but the Blues wanted the winner to be ruled out after a blocked shot appeared to cannon off the arm of Tariq Lamptey before eventually finding Mitoma.
WHAT WAS SAID
Chelsea boss Enzo Maresca was clear on his opinion of the situation following the game, after claiming football is "complicated" without VAR.
"I think the handball is quite clear," he told the BBC. "In the last two or three days there were many different moments in different games. Without VAR it's complicated."
Newcastle knock out Birmingham with help of 'ghost goal'
WHAT HAPPENED
Birmingham goalkeeper Bailey Peacock-Farrell appeared to have made a wonderful close-range save to keep out Newcastle's first goal from Joe Willock in the dramatic 3-2 win, but with goal-line technology not in use in the FA Cup at grounds below the Championship, the assistant referee flagged to signal the ball had crossed the line.
Willock went on to see a second 'goal' correctly ruled out for offside later in the game.
Man City avoid Orient upset at a cost
WHAT HAPPENED
Manchester City were able to overcome an early scare against Leyton Orient but some will argue the opener from the hosts should not have counted in the first place.
Shortly before Jamie Donley launched his long-range effort from just inside the halfway line, which cannoned off Stefan Ortega and into the back of the net, new signing Nico Gonzalez was bundled off the ball aggressively before eventually going off injured on his debut.
WHAT WAS SAID
City boss Pep Guardiola stated "one or two" decisions were missed during the game, with the challenge on Gonzalez offering a stark reality check to life in England for his new midfielder.
"I think Nico got immediately what is the Premier League and the referees," Guardiola said.
"I know without VAR it is more difficult because they are not used to it, but there were one or two actions. I say that because we won, otherwise I would stay silent, but there was a clear penalty.
"I think he understood perfectly what England is. It's a pity because I don't know how hard the kick is but he could not continue."