I finally got around to buying a pair of these, and I love them!
These have my favorite sound signature - heaps of treble with clean but deep bass. My only complaint is that the sub-bass isn't as pronounced as I'd like.
I use this track to gauge how well a pair of headphones brings out sub-bass. There's a rumble at around the 29 second mark that's nearly inaudible without sub-bass-capable gear.
I also see what people are talking about re: the treble, but I actually don't find them all that piercing, though it'll certainly be a relief once the burn-in takes the edge off them. My tolerance for these levels of treble really does make me worry for my hearing - after blasting my ears with the ridiculously trebly white XKDUN CK700s for the last year, I'm starting to suspect that I've screwed my ears over. Yeah, I could listen more quietly, but I listen to a lot of hardcore punk and metal, and that sort of stuff doesn't have the same visceral impact without high volume.