I applied this year to 14 MSTPs. I was lucky to get 7 interviews and so far one acceptance, one alternate spot, and still waiting to hear from one last school. Applying as a non-trad is tough but if you want to do science and medicine definitely go for it. One piece of advice that I didn't do, look into the average age of matriculants at the schools that you plan to apply to. Some schools I have found are definitely more non-trad friendly, and had I know that, I would have sought those programs out. At other schools the students seemed very young and they tended to challenge me on my age (which is fairly young for a non-trad, 26). Feel free to PM me if you have questions or need advice.