Be aware that you should NOT use these if there are other people around you, they will hear what you hear minus some bass.(The coloration is tacky, but that's a minor complaint)The work wonderfully with the O2/ODAC or Vali/Magni/Modi combos.

Coloration has never been measured on a routine basis, if at all, although it typically degrades a loudspeaker's or headphones' transparency more than anything else.

The 2 speakers about the head effect is a result of excessive driver coloration and compressed sound

These headphones have excessive driver coloration

I have around 7 pair of professional/audiophile headphones and these are as good as it get's in my opinion

i really wanted a very nice pair of headphones for checking my mixes on as well as for listening to music on without throwing off my ears

In short: These are as good as it gets -IF- if your reason for wanting headphones doesn't include recording

I use these in my home studio for late-night composing and mixing, as well as for pure enjoyment.

These headphones handle it all as well as you can imagine, and will expose items in your favorite songs you had never heard before.

Not to mention their open-back design and 300 ohms of impedance mean you shouldn't be using them while traveling, though this doesn't bother me as I use the at home

Although there has not been sufficient time for burn-in the phones are superbly accurate (especially in the midrange: vocals, woodwinds, etc.) as well as in the wonderfully detailed highs (in an odd turn of events I happened to find that the HD 600 was not much less in the highs than my Koss electrostatics)