I'm impressed by the application of VAR for the handball/red card/penalty situation leading up to Gyokeres's 3rd goal in the Sporting vs Estrela match (Portuguese league match).
Initial on-field decision was red card for handball that denied a goal, penalty awarded. Ref called to the monitor, and in reviewing the player who handled the ball was not deliberately putting his arm in an unnatural position (in fact, he was actively withdrawing his arm, and trying to get his head on the ball). More critically, there was a player on the line who would've blocked the attempt on goal regardless of the handball anyway. In the end, the red card was downgraded to a yellow, with the penalty decision remaining.
What was most helpful was the immediate announcement directly from the on-field referee about his decision as he was walking away from the monitor and back to the situation on-field.
I couldn't believe the level of refereeing competence I was seeing from a situation that required some level of interpretation, and the transparency to the crowd in real-time.