Pretty smooth, takes a lot less to get to final round, but that means in final round there is a lot less room for sloppiness than other final rounds. Not sure about the Neurolympics nonsense, they make you do another variant of it also just before final round to they clearly think its valuable!

I can only really recall the penultimate round, which was with a recruiter who gave a mixture of behavioural/motivational questions and then some sort of stand-alone probability questions. Generally a good experience.