Product detail: Ultra fine, high strand count, silver plated Cryo treated OCC Silver plated copper and Cryo treated OCC copper. The base metal used is a unidirectional UPOCC. Being almost free of impurity (99.99999% pure copper which is then silver plated, SPC = silver plated copper) The return signal uses OCC Copper without the silver plated which we have found to be a very good sounding configuration. this gives the cable ideal electrical resistance properties with almost no crystal boundaries. This allows the cable to transmit electrical signals faster and with less distortion than ordinary OFC and silver wires. This cable comes terminated with a 6.3mm high end Viablue jack. The headphone cables are litz braided by hand in the UK and included Cardas connectors as well as Cardas solder. (most detail was copied from website)
Customer service: Frank has been written about elsewhere and lived up to the excellent communication and honesty in my transaction.
Sound quality: A slight but distinct improvement in the speed and detail over the stock cable was noticed. The HD600's don't seem so laid-back as before but there was no noticable improvement in bass slam.
Value: I considered the modest price of $125 US (converted) money well spent especially considering my mainly rock music files (mostly MP3 @ 320 - a few FLAC). The HD600s would not justify spending more in my opinion.