OK so two days later I am really, really liking these. Really. They have this extremely well-spaced sound (can almost sound disjointed at times) which is something I really, really like about the $50 Cyclone PR1 Pros (and which caused me to ditch the RE0s for the PR1s). These do it even better. I definitely prefer them over unamped RE0s for rock/metal. The clarity and instrumental separation are incredible - easily on par with my CK10s. The highs are not as sparkly as the RE0s' Even with only ~25 hours on them there is no harshness and no sibilance. The midrange is neither forward nor recessed. It is just right. The bass is there but it is anything but dominant. As everyone else has mentioned, the balance is impeccable. Basically, these just let the recording do its thing. I have had my tracklist switch from a calm track (Annihilator's
Crystal Ann) to an aggressive one (Dream Theater's
Dark Eternal Night) and been totally amazed at how well these phones adapt to the music. It is truly a tranformation and the versatility of these is epic.
I'm sure that not everyone will like this signature but for me it stellar. The only phones I have experienced that may beat these in neutrality are properly-amped K601 (for which I don't have a proper amp at the moment

). I don't know if I will end up liking these in the long run or hanker for the warmth and familiar intimacy of the CK10s, but for now I can't put them down.