The interviews were fair and the atmosphere supportive. The interviewers in general were more senior compared to other firms, which I think is good. The ones I had interviews with were either principals or managers.
The cases were tricky but doable, wouldn't say that they are any different from the ones I had at Bain or Roland Berger. The presentation was a bit uncomfortable, but not more than the group exercise at Berger was. You have to present in front of two interviewers and they challenge you regarding specific aspects of your presentation and want to see why you presented it the way you did. Fair process and a pleasant experience.