Wow, incredible comprehensive review. I am looking for the CK10 but they seem to be out of stock everywhere. Does anyone know of a good source. Is this a sign that a new version is on the way?
It seems that Audio-Technica has ceased to export the CK10 to US retailers. You can still get them through an independent importer (e.g. AccessoryJack or hovanfue.com) or perhaps one of the international shops (e.g. Jaben/unclewilsons). Lastly you can use a forwarding service to buy them directly from Japan, though you'd have to do some googling to figure out how.
As for the new version - that's anybody's guess. Audio-Technica has been tapering off exports of the CK10 for a while and the CK100 has never been sold in the US officially. Both of the earphones have been removed from Audio-Technica's ads stateside as well. Could be a long-term decision from lack of sales or maybe a new one really is in the works.