Just took an ODAC board to home this week. I was waiting for this day for so long (after several months to save enough money ). So far so good but ODAC and C421 OPA 2227 pair with HD598 is still not strong enough to take me to heaven yet but may be so close, at the heaven gate. Next upgrade is the MoonAudio Black Dragon V2. Keeping saving money .
Dude, stay away from that cable. Either pick up an O2 or move up in the Sennheiser line or stay put. You are not going to get any noticeable improvement from that cable and anyone that tells you that you should spend that much on a cable for the kind of cans/gear you have is not your friend.