Still haven't charged it, myself
Though I was listening to it just now. I think I've only had time to listen for about 5 hours now, so I'm still forming an opinion on the sound (and learning to pay closer attention).
This isn't what you were asking, but somewhat related: my iPod died partway through listening this morning. With the L11 plugged in to amp and charging the iPod, I didn't notice any change or noise. I still think it's a bummer that the L11 USB tip is different from the E12's.