I went to Tufts.
I applied to all the post-bacc programs in Boston and really found Tufts to be the best one. (Admissions directors at medical school rate it as one of the best in the country. You required to take 6 classes at Tufts to be eligible for the committee recommendation letter--at Brandeis it is 7. They teach Orgo in the summer--at Wellesley, they require 6 courses and teach none over the summer.)
The Tufts program is expensive, but it boasts a 90+% acceptance rate to med/dental/allied health school the first time around. You take classes with regular undergrads, so there is no doubt that your curriculum and science experience is sub-par, which can be the case with some extension school programs. And the classes are rigorous and very good preparation for the MCAT. The administrative support is pretty good and they organize workshops for you on studying science, time management, and applying to med school. (I just held one of these workshops recently myself.)
You can conceivablY finish Tufts in 1 year. I did, but I did not have to take Biology. A colleague of mine did it by taking 3 lab courses simultaneously in the Fall and Spring and taking Orgo in the summer.
Another cool thing is the job situation--the jobs that Tufts students hold at Mass General, Brigham and Women's, etc., tend to passed down from one generation of Tufts post-baccs to another. I did not take advantage of this, but many of my friends did--it's mostly clinical research, but there are other jobs as well. One guy helped run a path lab!
Tufts feeds pretty heavily into Tufts Med. Actually, you can apply jointly to the post-bacc program and to Tufts Med. If you are accepted to this program, you need to maintain a 3.4 GPA at Tufts and score a 27 or above on the MCAT. (I think the GPA thing may be somewhat flexible, however.)
Overall, Tufts was a great experience, and I feel that it was integral in my pretty successful application year.
If you have any questions, you can always PM me!
Good luck!
mma