Amp Power Conditioner or not?

I was moving some equipment around and plugged my amp - MF NuVista M3 w/ Nordost El Dorado cable - directly into the wall for what I thought would be a few minutes. To my surprise it sounds better. More open, smoother, less conjested, more three-dimentional. I think I'm going to leave it that way.

Anyone else have the same experience?