I am using their Pro-9+ speaker cable and Pro-Silway Mk2 XLR interconnects in my Theta Dreadnaught, BAT VK-50SE, and Martin Logan SL3 (just upgraded to Vandersteen 5 few weeks ago) setup. They are very very good. There might be other cables that out-perform these but in my system, they are at the peak of my cost & benefit curve.
I also tried the new Fantasy AC-10 power cord on both the Dreadnaught and the VK-50SE. Unfortunately, I could not hear any difference from a regular 14 gauge stock cable.