I have, unfortunately, broken many Sage rods over the years, and they have always done a fine job of either repairing or replacing them without any questions, in line with their warranty policy.
Except for their first generation rods, on which I believe the graphite was brittle and with insufficient flex, I can't think of having any other Sage rods break due to a defect in the rod itself. I've had, and have broken most of them over the years, through and including graphite II, III, RPL, SP, XP, and Z-Axis. Haven't had time to break the Sage One model yet, but give it some time...
However, I have broken rods in practically every conceivable fashion. I suspect when I send each broken back to them, they just roll their eyes and put another notch on my bad boy chart.
John