HE6se does indeed sound excellent. I'm using a Emotiva A100 with self made banana plug cable.
Obviously did a grill mod. It makes it sound less claustrophobic. The song that I immediately noticed a difference Hotel California on the Hell Freeze Over CD. The beginning where the percussive wood block (sorry if I didn't get the instrument right), it went from inside my ear to a good 2 to 3 inches outside my ear.
As far as bass impact or whatever, I never really understood when people say it's "visceral" or whatnot. The bass is great though. And as far as imaging, well, to be honest, I hate headphones
They're a necessary evil to me, even my Yamaha soundbar sounds better as far as imaging and sound stage when listening to the same tracks than any of my headphones, HE6se included. I can never get any depth to anything, only left, inside, and right no matter which headphones I listen to.
Still, I'm absolutely thrilled that I was able to get these for the sale price, they're definitely worth it.