I finally took my Morrow Audio MA4 balanced interconnects on a field trip to my friends house. He has Martin Logan speakers with a Krell stereo power amplifier fed by a Topping DAC. It was a very quick listening session, but we started with a few songs with his current setup, then moved to the Morrow Audio interconnects, and then switched back.
I don't listen to his setup very often, but found the Morrow Audio interconnects to be superior with us both able to describe the same differences. I think the most notable thing that happened was when he put one song on that wasn't part of the original baseline and noted that it had never sounded better. I am not familiar with the song/album, but was immediately impressed with how it sounded. When we switched back to his cables that song simply lost its magic for both of us. It was the song that'll haunt him until he upgrades. With the others he was mentally calculating the value of the price of the upgrade, but this song seemed to demand it for him. Since I've been home I got a text with him wondering how things might change for orchestral music since we were only listening to solo vocal music. It was a fun hour of listening however brief. By the way, his currently interconnects are not audiophile approved :-0