We went last night to this and I have mixed feelings.
It was brilliantly acted and based on a bizarre true story, but I had a bit of an issue that we were meant to root for the Jim Broadbent character when mainly I felt sorry for the poor wife played for Helen Mirren who had to carry the family financially whilst he went off on his causes.
On the plus side it was 96 minutes long - so much better than all these 150 minute monstrosities around.