I particularly like the block style exams...yeah, you study all the time as it is, but you dont have the pressure of an impending exam every week.
That was the the reason I never bothered going to lecture, had to study for a test every week, and most of the people I saw during lecture on the rare occasions I went were not paying attention, many were goofing off on Facebook or socializing with their friends. AZCOM uses that system because it makes the students more vigilant about medical school and particularly the boards.