US Frame builder Harry Havnoonian is a big advocate of this type of brake mounting, he believes mounting the brake "forward" of the seat stays gives better braking thanks to better transfer of the forces into the bike frame.
Havnoonian cycles http://www.hhracinggroup.com/
Mark Petry
Bainbridge Island, WA 206 618 9642 <mailto:mark@petry.org> mark@petry.org