Just for some balance...
I interviewed at Brown, and have spoken witha number of Brown grads... the 6 year program at Brown is NOT the equivalent of other 6 year programs. It is designed to be 6 months of a trauma fellowship and 6 months of research during your 6th year. And as per the chairman, if you are able to complete significant research earlier in your residency, you can then take those additional 6 months during your 6th year to set up a mini-fellowship... a number of residents have done this, and have completed 6-month rotations with some of the best surgeons in the US (thanks to Dr. Ehrlich).
As to who benefits? Debatable. Certainly the program benefits from the research and the existence of 2 house traumatologists at all times. However, if you think that the research doesn't help graduates, you are mistaken. Their projects are typically completed LATE in residency, unlike most programs, allowing you to do research in the field you are pursuing. Moreover, any hospital that hires you gets someone with 6-months of attending-level trauma experience at a major trauma center under their belts. While the 6th year might be a little long for some, and probably unecessary for those going into private practice, you need only look at the fellowship pedigrees and staff positions obtained by young Brown grads to appreciate the impact of the 6th year on an academic career... I think it speaks for itself.
personally, i think this program is overall one of the three best I interviewed at (of note, Rochester would have also appeared on this short list). I was extremely impressed by the combination of academic strength with a down-to-earth attitude. Regardless, take all of these opinions with a grain of salt, but take the time to consider the program from multiple angles.
DrH