For the benefits of those who may be considering this program, I want to provide a different perspective than the one provided by
@iobu here.
I was a MBS graduate for the class of 2014-2015. I am currently finishing MS1. Based on my personal experience, I can say for sure that I would not have gotten into medical school without the Tufts program. I also don't believe that MCAT is all that matters. It depends on the individual, your experience, your story, and the schools that you are applying to. If MCAT is all that matters, I would never have gotten into med school.
I wrote a post last year (
My Journey - Low GPA/Low MCAT) that has more details about my journey.
In summary, I took MCAT 4 times and never got over a 29 (new score equivalent of 506/507). When I applied in 2014 (during MBS), I received no interviews at all. I re-applied after I completed the MBS, and received 4 MD and 1 DO interviews. The MD interviews turned into 3 acceptances (one with scholarship), including Tufts, and 1 waitlist (which later also turned into acceptance). Between my first and second cycle, the only thing I did differently was the MBS program. You can make your own judgment on whether MBS helped me gained med school acceptance or not, but I think the case is pretty clear.
While I don't know everyone in class, for those that I know, they have all gotten acceptance into medical schools (yes, a few of them are in DO schools). This is true for a friend of mine that has a sub 3.0 undergraduate GPA. None of my friends have super high MCAT.
Tufts' MBS program does prepare us very well for med school. Despite my atrocious MCAT record, I finished MS1 in the top quartile of my class. I know very well that none of these would have been possible without the MBS program.
Is the MBS a program hard? Yes, absolutely. But it will get you where you want to go if you are willing to put in the time. The journey is long and hard, but it is definitely possible with the help of the MBS program.
Yes, Tufts doesn't provide guaranteed admissions to Tufts Med, but for MD schools, there are only two programs in the entire country that offer that: (1) The ACMS program at Temple, which is about as hard to get into as med school itself, and (2) The ACP program at Tulane, which requires you to be waitlisted at a med school to apply. If you are looking for a SMP program at a MD school to strengthen your credentials, then it is definitely worth considering the Tufts program.