Upgrading power cord.. proven upgrade? or crap?

I confess, like Sean I used to be a non-believer. When my sim4070 amp came back from its factory upgrade to a full SE it had a detachable power cord. I picked up an abolute power cord because it was cheap and it couldn't be that much better but I wouldn't be out much. The amp had been broken in[it takes a long time with the upgrade].so I stuck the absolute on and hit play. Dude, what happaned? The amp was plugged directly into the wall as preferred by Jean Poulin at Sim....musicality and bass, and timbre and notes decaying as they should. I had to play everything over again. I can only imagine what the better power cords do but if anyone is running a 4070se without changing the stock cord' they have not heard what this amp can do. I no longer lust after a moon, Okay I still lust but I'm very happy....cheers, Bluenose