I am using the Kubala-Sonsa and not the most expensive one. I didn't not compare it to a host of other cables in any meaningful test, although at different points, I did have some Shunyata power cables hooked up to the system. We added the K-S incrementally to the system, starting with the ML 2 amps. Each additional cable, even the ones powering the woofers, made a noticeable difference.
I have the Lamm linestage that is in two chassis, if that is the model you are referring to, and the K-S cables work well. Not shilling for them, FWIW.
Interested to see what others have to add.
Best,
Bill hart