I've had great results with their S-L speaker cables, in my system the sound produced with the Nirvana product is head and shoulders above the Cardas Nuetral reference, Discovery & Tara cables that I had auditioned.
Nirvana Interconnects and Speaker Cables
I just got done auditioning their new SX interconnect against others in price range This is one good cable. There in more "there there" , Will try their SX speaker cable this week. Anyone using these? What cables were evaluated before selecting these?