So Cash, would you be willing to tell the eBay seller that there is yet more demand for the headphones? I'd rather not have to Aliexpress or Taobao them.
On the comparisons with the S500, just wondering, and I don't mean to offend: did you burn the S500's in? The thread on them contains several instances of "'I just got these and something sounds off.' 'Burn them in first!'"
As for burned in EFi-82 MT's sounding like HD-600's, that's why I'm so curious!