10-12 years ago they were the reference but there's a lot of KS on the used market now, so they are not what they were.
What is interesting is what has taken their place?
Crystal, Shunyata or something more exotic?
Kubala Sosna Cables - Reality Check
I am auditioning some of the Kubala Sosna Expression interconnects and speaker cables. My initial impressions are that these wires are a bit to the 'warm' side of neutral. (Not complaining or criticizing the cables - just making an observation). Have you gotten similar impressions in your rig with these cables?