I interviewed at AZCOM in October. I was super psyched about the school. I also interviewed at other DO schools, Mayo, Case, and UW. AZCOM is second only to UW on my list of acceptances, and only becuase I would have to move away from my husband for two years (he loves his practice up here in the Northwest) and AZCOM is WAAAAY more expensive. BUT, I'd be happy to attend AZCOM. I love the DO philosophy. I hate when people say that only those who cannot get into MD programs apply to DO programs. I'm proof of that many qualified applications to MD choose DO instead.
To answer your question about your chances, it is true that when admissions are rolling, your chances are better early on. With that being said, however, I was told by the admissions office that they don't set a firm limit on the class size. If someone comes along who is a good fit, even after the class is filled, they will make room for that applicant. It seems to me that AZCOM is the most selective of the DO schools in terms of granting an interview, so feel good that you got one!
Knock 'em dead! If I don't get into UW, I will see some of you next year. I look forward to it. 🙂