you can say the same thing about any mechanical peice in the car.never had one straight up fail and i have been spraying alky/meth a very long time.i have seen more fuel pumps fail and they fail straight up,the alky ones leak first so it will drop pressure gradually,which can been seen with a gauge.
these in tank adders do work,but i would caution guys with getting to aggressive with boost and timing as you dont know what octane is actually going into each cylinder.guys that know how to tune understand what i just wrote and guys who think they can just turn up the boost can hurt something.