It's not time to talk about them as title contenders yet, but people now know that this is a different Arsenal to the team we saw just 13 months ago.
Everything was different about Arsenal this time - in attack and defence, plus the way they controlled the game, and with their attitude and intensity. They ran out comfortable winners.
Part of that was down to how bad Brentford were, but it was Arsenal's performance that made the Bees play so poorly.
I was expecting Brentford to come out flying, knowing what worked last time, and trying to hurt Arsenal.