I have tried the SignalCables extensively and have compared them to much more expensive cables. I find them every bit as good and in some ways better than the more expensive brands.
What a few of the above folks fail to realize is that there is a great synergy among the various types of SignalCables when used throughout a system. If you only try one or two types, then it is very likely that you are missing most of the magic this line is capable of providing.
Indeed, when I randomly threw in the speaker cables, interconnects, and power cords (swapped in and out, one at a time), the improvements were minimal or were a step backwards. However, when I put in the power cords, then the speaker cables, and then the interconnects all at the same time, there was an order of magnitude improvement across the board. I also had great luck with their digital AC cord, digital coax, and interconnects in another system.
Inserting the interconnects by themselves seemed to be a backward step in that system. But when I put in the digital coax, then the digital AC cord, and then reinstalled the Analog Two interconnects, there was a tremendous improvement.
So SignalCables may or may not work well with your existing cable products; but they work fantastic when partnered with other SignalCables. At least, that was my experience.
I like them so much, I use them in both my 2-channel systems now. I find them extremely dynamic, detailed, and well-balanced. At their price, I find them absolutely astounding.
Some of my other cables include Sonoran interconnects and speaker cables, and Harmonic Technology Magic One interconnects.