Very hands-on interviews and based on real world scenarios. If you haven't been through some of those scenarios in your career, you'd have a hard time answering a lot of the questions.
I spoke with a total of 6 people in different occasions, whole process took around 3 weeks. The Interviewers were very knowledgeable and had specific goals as far as checking my skills (technical, political, communication, client facing, documentation, prioritization, conflict resolution, ability to influence, etc). They were all nice and welcoming, but also rigorous.
They will absolutely read your entire resume and ask you specific questions about what you've done in the past, so be prepared to refresh your memory. They were interested in skills I thought I'd never use again, so they're looking for people with a good breath of knowledge and extensive experience.
HR, recruiter and admin folks were very responsive, professional and polite, much better than the average IT company.