I have flown the 757 on AA from ORD to CDG, MAN, and LHR. I have also flown BOS to MAN where the front cabin was used for elites. I have never flown the 757 configured for Business Class, as AA sometimes does. If the choice comes down to coach in a 767 or 757, I will usually choose the 757, because it has more "desirable" seats for me. I am tall and fat (see the appropriate thread). There are only 10 or 12 comfortable (for me) seats on the 767, while there are 18 on the 757.