So, after reading various experiences in this thread, I bought a pair of ATH-CKS77LTD's on eBay from a Hong-Kong based seller. It arrived today.
First, these things are gorgeous. Loving the metallic red. They're much bigger than what I'm used to, and I have to say I find that a little uncomfortable, but I could get used to that if the sound is as good as I read. I gave them a quick first listen, and they're clearly in need of some burn-in, but the lows sounded very good. And, wow, these things are absolute bass-cannons.
Sadly, I quickly discovered there's something loose inside the left earphone. It's very easy to hear when I shake it, sometimes even when I take it out of my ear. I'm not sure how worried I should be about this. Just in case, I contacted the seller asking if I could get it replaced, if it does turn out to be a problem...
Those are good folks, it might take a bit longer but I am certain they will replace it. They are fair people=good people in dealing with them. It does seem the rejected pairs probably has zero burn in. I noticed I had to burn my pair in but got to the same sound as my original.
I'd just like to chime in here and say how surprised I am yet again with Audio-Technica's house sound, especially to how it relates to female vocals. I don't like how Sennhesiers make female vocals sound. Papery and thin. I think it's due to the rolled-off treble that many headphones have. I can remember the M-Audio Q40 having a papery quality to female vocals and having them just sound so distant compared to everything else in the spectrum.
On the Ath-M50 and the CKS77 moreseo, it's like there's some distance between the listener and the female vocalist. It's like there's time for their voice to get some air before it enters my ear canal. It feels like they're talking to me at 2 or 3 away. Not too close and not too far. This might be the Audio-Technica sound signature and I absolutely love it.
I think I"m becoming more of a treblehead as time goes on due to what it gives to female vocalists.
As another point of comparison, the Philips Citiscape Uptowns and Dwontowns have their vocals sound very shouty. It's fun, but unnatural in comparison.
Koss DJ100 sounds great with female vocals.
You have to try a CKM500. It is awesome for the price. One of my all time faves for certain. More of the new AT house sound. These CKS77 are too much fun not to have. I love using them for gaming too. These and Diablo 3 is crazy.