I work at Tufts Medical and I also interviewed (and was admitted at Brown) this year.
I love Brown, and I'm seriously considering it against Mount Sinai (which many people would be tempted to say is even a more "no-brainer" choice when compared to Tufts vs. Brown, but Brown IS that good, in my opinion).
+ Brown is the only medical school in the entire state of RI. This is actually more significant than it sounds, even if RI is the smallest state in the nation. Brown's affiliate med centers practically take care of everything that goes on in the state (med students can opt to work on a 2-man clinic in one of the Bay Islands, providing health care to the rich folks that vacation on the island). Their system is quite comprehensive, from private hospitals, to public med centers, to a VA hospital as well. Also, one peripheral "benefit" that a M4 mentioned to us when we were there is kind of funny if you think about it, but I thought it was still pretty cool - some medical organizations have representatives by state, so the chapters in each state nominate a person to represent the state at the annual conference...guess who gets picked to be the RI representative? ; )
+ I expect Brown's rankings to jump after the new med building is finished. I think for a long time Brown has been held back because of their ancient facilities+infrastructure, but it looks like the administration is trying to change all of that after the new building is complete. This should reduce a lot of the criticism that Brown has had about outdated facilities. The initiative to give the class of '15 IPads or laptops is another example of serious commitment to med students.
+ They are decreasing the number of PLMEs and taking more "AMCAS admits."
+ With the opening of the new building, Brown is also going to adapt the "academy system" for its med students. This is the model that HMS follows with their societies (cf. basically like Hogwarts, where students are sorted into houses). This change is propagated partly due to one of the new admins in charge of student life that they have, who they pulled from HMS actually.
+ Brown's "Doctoring" program is one of the best mentoring/getting M1 and M2 exposed to clinical care systems that I've seen across the 9 schools I interviewed at. My SO goes to UCSF, and I think Brown's Doctoring system even beats their preceptorship program by far.
+ Look at how Brown med students match. They actually match disproportionately well to Boston (read: Harvard-affiliated programs), and a significant number manage to match to California as well. You would not expect this kind of match list from a school that's ranked in the mid-30s.
+ Something related to the above is that Brown seems to have a very good relationship with HMS. Brown students can access the Harvard Medical Library System (online and I guess in person too), and the Admissions Director told the people at my interview day who are interested in the MD/MPH program to just do the MPH at Harvard, because they take a ton of Brown Med students. This is something that's curious that I didn't know about until interview day.
+ The class is small, which I really like. ~100 is the ideal size for a med class.
In my mind, Brown vs. Tufts is basically no contest (I withdrew from Tufts (and a lot of other schools) after Brown). Good luck!