My impression is that the quality of the conversation is unexpectedly better: more self-critical, the suggestions are always critical, the default choices constantly best. I might not have as many harnesses as most people here, so I suspect it’s less obvious but I would expect this to make it far more valuable for people who haven’t invested as much.

After a few basic operations (retrospective look at the flow of recent reviews, product discussions) I would expect this to act like a senior member of the team, while 4.6 was good, but far more likely to be a foot-gun.