My experience meeting him
This guy gets a lot of bad things said about him, maybe it's because of his rather rude Twitter messages.
I met him on a train back from London, he was with his friends, I was worried when I approached him in case he and his friends would have a good laugh at my expense. Though his friends were acting silly and finding it funny that I would like to talk to Jack, Jack acted completely normal and in fact invited conversation.
I simply asked him if he was Jack O'Connell, to which he replied "I am indeed. Where you getting off?" I replied with "Right now." and he said "Oh okay, well, it was nice meeting you, have a safe journey back, alright?"
Very friendly if you ask me. He played it very cool despite the sniggers from his friends.
Very pleasant guy it seems. Obviously I can't say that for sure but he did seem very lovely. He's a lot like Cook from Skins in real life!