I find they're almost always entirely useless but there are certain exceptions. When I was a students and bought my first (CRT) TV, I added a seemingly well priced extended warranty which came in handy when it stopped working after a few years. The picture had gone darker and darker every few weeks for months. The repairman came over, opened it up, cleared the insane amount of dust that had been trapped, degaussed the screen, and swapped out a bunch of parts that looked like motherboards. That whole experience saved me a ton of money. I wouldn't have had the funds to buy another TV, that's for sure. The TV worked fine after that. A few years later, I gave it to a friend and it was still working top-notch. Have you ever benefited from extended warranties?