I couldn't disagree more.
The HE-6 does everything better by a wide margin when compared to the HE-500. Yes, of course proper amplification is required. When you have the right amp. The HE-6 scales higher than any other headphone I've heard. With each of the TOTL headphones winning in certain things over the HE-6 like.... HD800 for sound stage, LCD-3 for Bass, 009 for clarity. But the HE-6 does all these things pretty darn good as a whole. a la the "GENER MASTER"
Heck the HE-5LE and HE-4 may be more balanced than the HE-500.
The HE-6 is the true Flagship no doubt..
he was just talking about the inefficiency part being a headache making it not the flagship. I have to agree that the power they need makes them pretty much "special needs" and it is a definite turn-off. I have only heard he-6 once and i could determine that it was about 10-15% better than he500 in almost everything which is a big difference when you consider high end gear.