I don't think it much matters if you can't hear the difference. Isn't that the ultimate test? I trust your judgement more than my experience- after all, your ears are in the room. One caveat- don't listen to those who say cables don't matter. They do. Luckily my wife has great ears and can hear the difference too. When I upgraded to Siltech she heard a big difference. The previous upgrade to Synergistic Research had been a big disappointment. A lot has to do with your gear. One nice thing about Audiogon, is that you can try a lot of things cheaply.