I just started replacing stock power cords this week so I’m glad this topic showed up. I’ve heard nice improvements with interconnects in the past, not so much with speaker cable, and I always stayed away from power cords thinking it was total snake oil. Then I read some audio forum posts saying power cords were the most important of all the cords you could replace and it turned out to be true. I’m trying the Wireworld AC cords. For the cost of one large component upgrade, I was able to take all of my components to a higher level. Really pleased with the results and surprised I went so long without trying it.