Warranties are a concern with a custom rod. The manufacturers will stand behind their products and honour warranties on the blanks and/or any components that that are covered. Your parts and labour (or those of your builder) are not covered and therefore you must bear the costs. The advantages to a custom rod (especially one you have built) are a slight savings in cost and a great deal of satisfaction in getting a rod that has the esthetics you desire in a companion you will spend many, many hours with. I do believe that I treat the rods I have built with a bit more tenderness than I do others that I have merely laid out cash for, and this in itself helps to lessen the likelyhood of breaking one. There really is no overwhelming rationale to justify a custom built rod any more than there is one to justify spending 1/2 a thousand or more on a commercially built one. A $59 dollar broomstick fly rod will catch fish as well as a $1000 dollar Winston, the only real difference is the value the angler places on the instrument.