I interviewed for 2 different courses, accepted the offer on one of them. The experience really depends on which course you interview for, and also who interviews you. One was a standard motivation and getting to know you as a candidate type of interview, while the other one was a grilling session on how much you know about the programme/chair partners of the course.

30 min interview with three people : a professor, an alumni and a current student. Personal and professinoal questions. they often try to distract and confuse you. It is quite hard.