Tubulus Concentus V.2
My wife does not listen so closely but heard the difference. And the owner is really patient and nice to deal with. A little less expensive than other top-end I2S cables and right up there with them. I would not want to be without my Tubulus Concentus.
Also, While shorter is better as stated above, the owner assured me that with their design adding no more than 1' is not hearable. This matters if you are using a rack because good I2S cables are a bit stiff coming out of the connectors, needing more turning circle.
-Jeffrey in Philadelphia