To answer the original question; No, they are not worth it. Not sure why you can't use less expensive RCA's throughout multiple installs as well. Or hell, if they were cheap enough don't waste your time pulling them from the car. Send them with the car, buy another affordable pair and still be ahead money, and time.Very few people need to use a warranty on cables. Of the few that do, it is still cheaper to buy multiples of a more affordable cable than to buy one expensive cable (and then potentially have to deal with trying to get it warrantied). Plus a warranty is only good if the company is still in business and, no offense, statistically you have a very low probability of being around mid to long term. Likewise if he is using a UTP cable and doesn't experience noise, then the shielding isn't going to matter