Marin replaced my frame when it broke on the downtube (and the seat tube, and both chain stays - I'm not joking, as well as the downtube snapping in two at the headset, the BB didn't have an unbroken connection to the rest of the bike) with no quibbles whatsoever. However, to keep the warranty going, I had to pay Cycle Surgery to re-assemble it, which in retrospect I wish I hadn't bothered doing. I'm demoting my CAAD8 to commuter.