My interview(s) for a Sales Manager position with CSM was one of the more difficult of job interviews I've had. The questions were hard-hitting and dug deep - make sure you go into your interviews prepared with answers regarding your market, your experience, what you'll bring to the company (as well as how you'll do it), explanation of your strengths/weaknesses, and how to deal with some complex challenges.
If your interview is anything like mine, as a manager, you'll first interview by phone with a member of HR. If they feel you're a good fit, you'll end up meeting with your department head first. The second interview was with the regional representative, followed by a third interview with the General Managers of the properties you'll represent. All-in-all, I probably went through three or four interview sessions with different people before an offer was made. This seems to be very standard.
I knew going in that it was a lengthy process and that CSM very much tests their applicants - it can be a harder company to get into, but CSM is extremely committed to their culture and takes great care to ensure their hires will be good fits with not only their future co-workers, but company as a whole.