These cans sound fantastic! I have them running through a Schiit Magni 3/Modi 2 stack that powers them with ease. I've also tried them powered through my phone (HTC 10) which also works and supplies sufficient volume, but doesn't sound as good as when they're amped. The soundstage on these is fairly wide, and with a well recorded piece of music, these can really make you feel like you're in a room filled with sound, which is especially surprising for a closed-back design. As expected from the planar magnetic drivers, everything sounds very crisp and clear with a precise attack to notes. The bass is well extended and plentiful without being too overpowering or muddy. The midrange is neutral, bud Doesn't feel recessed. I like to use these headphones when listening to electronic music, live recordings, or especially technical classical pieces. The large plush earpads are very comfortable, however the headband can create a pressure point with extended use and could use some improvement.
I must admit I'd been worried about buying something "Open Box", but the quality assurance folks did a great job to make sure I wasn't ripped off. They sound amazing, are of good build quality, and I'd absolutely buy them again if I needed to.