Our class at Buffalo (Class of 2009) had a 100% pass rate on the first attempt (for part I).
Just a piece of advice: I'm from the Boston area, I spent over 20 years of my life there, and I came to Buffalo in a heartbeat over Tufts, Harvard, and BU. Unless you have a trust fund or a military scholarship to pay for your Tufts education, you would be financially foolish, bordering on severe stupidity, to choose Tufts over UB. Tufts may have a fine clinical program, but the extra $150,000 or so in debt is simply not worth it.
Just my $.02 from a former Bostonian and Red Sox fan. I'll be back in New England after graduating from UB.