I'm in the room, and have just seen President Trump enter and it's fair to say he got a good welcome from the crowd, certainly at the beginning. A standing ovation.
On top of that, there was an astonishing scrum to try to get in, with many turned away - even heads of state.
And the security was unbelievable, not letting even some of the most famous attendees in or out of the hall.
But, minutes into the speech, Trump was keeping his cool - even dropping in phrases about wanting the UK "to do great".
What some thought would be the day on which the US president laid down the laws of his new global economy was filled more with grandfatherly advice.
