I'm glad you like.
Welcome to the 580 tribe.
Your experience with it new reminds me of a little trick I did. I installed the 580 under the TV in my HT room, and had some friends come in to listen to my system. The whole time I was playing just the 580, but they thought I was playing the Dave Matthews/Tim Reynolds Blu-Ray concert (wonderful recording - it's really transporting) through my mains (two full-size tower speakers). You should have seen their jaws drop when I showed them where the sound was coming from.
Now that is cool. Clearly the 580 is a different animal than the 555. I did not expect the change in resolution, but I really should have. Bigger drivers, more drivers, better physical separation, much bigger amplifier. Nothing fancy about it, but man that box COOKS! Crazy good.