Just interviewed recently (for anonymity's sake, there's only like 20ish people per interview group). It's REALLY nice. People are great. Facilities are brand-spanking new. Mt. Pleasant is a nice town. The people there are super open and simply fantastic. MMIs were surprisingly laid back, and the interviewers were great. I went in a bit stressed out, but after interacting with some fellow interviewees and some students, I felt pretty good about being there. I really enjoyed their MMI format as well, and yeah, overall really solid day!
For preparation, I just read through CMED's website. Their core competencies are pretty important and relevant, as well as their mission statement. Just remember to draw on your own personal experiences, answer the prompt, and smile =D
Y'all will love it here!