Mike, when you look at how long the brand has been around, and the volume of "Sticks" sold worldwide, its no wonder that they are one of the only rod manufacturers to offer such a good guarantee.
The only other tackle supplier that has a better guarantee, is Orvis, who say they offer "Complete satisfaction or your money back". If you take this to the extreme, then any rod or reel, line hook, fly, lure, hat etc etc, that does not perform in your opinion, will be replaced free of charge. For instance, my sunglasses have been replaced three times by them, as the arm had broken, through "hard" use! They will even replace a rod that has been snapped in a car door or bootlid, I appreciate they can afford to do it at the prices they charge for some of their kit, but to buy a seven piece travel fly rod, for around