Yesterday I installed an A and a long C Permanent on my bass. Next to the Gamut unwound guts, these strings are great. I am very impressed with them. They have a very gut-like tone and bow and pizz really well. Certainly the best matching strings for unwound gut that I've found so far. They have a strong, centered, warm tone with decent sustain but not tonnes of it (not as much as the Dominant A and Spirocore long C I had on before). The arco on the low C is very strong and thunderous like the Spirocore was. My guess is that the G and D would be too bright for my tastes but I'd be willing to bet that teamed with Flexocors (of some sort) or Olivs, the set would be a dream.