Thought I'd add a few thoughts now that I've had mine for a while...
I've been listening to them while traveling with either my iPhone 4S and the equalizer app with an eq of +4db at 60Hz or iPad 3 with the camera connection kit and iBasso D4 amp. I have been extremely happy with the sound of these cans. Attacks are clean, bass is punchy (and can be driven well with a little eq), highs are crystal clear. In a few recordings with overly pushed high ends, I can add -4db at 10KHz and the problem is solved.
For the most part, I'm listening to jazz, folk, light rock. And, I generally listen to them fairly quietly (I think this is important as they seem to get more "sibilant" as volume increases past a medium/medium-high level.
I've had about 2 weeks of constant listening (most every night for a couple of hours) and just love them.
Tonight, I finally had a chance to listen to them through my home system. It's very basic with my apple tv 2 (1080p version) feeding a Fiio D3 with apple lossless files to a Little Dot mk III with Mullard 8161 tubes. I started with some Chanticleer (12 part professional men's choir)...
Freakin' amazing! Incredible clarity and blend at the same time. I can hear nuances that I've never heard in any other headphone (my HD650 included). I had an interesting choice- I could pick out a single singer or step back to hear the blend. They are amazingly revealing yet not overly-analytical. They just get out of the way so that I can enjoy what I'm hearing.
As I write these last few lines, I am listening to Pat Metheny's Secret Story. One of my favorite albums and one I've listened to weekly since the early 1990s. Needless to say, I KNOW this album (this is the remastered version).
Well, I thought I knew it. As it turns out, I didn't. I'm hearing sounds, textures, layers and percussion that I never knew were there. Seriously, it's just amazing. I've listened to this with my HD650 10+ times in the last few months and I'm shocked at how much there was still to uncover. I can see that I'll need to listen to this album a bunch more to catch these new additions. Just the bass textures alone are mesmerizing. Instruments that used to be little more than attacks now have tone and body. Layers are present in places where I only heard one instrument previously.
I wouldn't recommend these headphones for everyone, especially for the very high price, but I have to say, they're worth every penny for me. It's taken me some time to come to that conclusion- they were a bit of a hard sell at first, but they've really grown on me. For jazz, light rock, classical, and folk, they're just wonderful. Oh, and did I mention the soundtrack to Snow White and the Huntsman? Wow!!!