Is anyone using Signal Cable interconnects/cables?

I have. I found that Signal Cable is an interim step in the cable hierarchy. Certainly better than Monster and everything below it. Probably the best value in the Signal line is the Power Cord. I have also used the digital cable. I used the PC as a subwoofer cable with great success. Initially, I used it on my B&K receiver but when I jumped to a higher end PC ( Synergistic Research Master AC active @ 6 times the cost), I noticed how compressed the sound was with the Signal Cable, so on the sub it went. The digital cable replaced a Vampire Wire cable and provided more detail. It was replaced with a Synergistic Research Reference Corridor and ultimately with BEL-the Wire (which I now use for all interconnects). As good as Signal Cable is for the price and Frank is an outstanding guy to deal with (he's very honest about the sound of his cables and whether they will provide the sound you're looking for), you just have to do your own comparisons. Rich is correct about cables being system dependent. That's why we have thousands to choose from. Cables, as much as anything, have a land of diminishing returns (when is a $500.00 cable just another tweak?) I've found that $200.00 BEL-the Wire I/C's sound better than the $600.00 Synergistic Research I was using with my system. However, I still use SR speaker cables because they match my Tannoys better(richer, fuller sound). If it's about money, give the Signal Cables a try, they're still comparable or a step up from much of what's on the market.

For the price, Plato's cable synergy theory is certainly something to look into. However, I personally find belief in the "all the same cable" synergy theory a bit of marketing hype. Cables have specific sound fingerprints as do components. Neither is really neutral. So consider that a speaker which has a bright sound could sound even brighter (harsh) with the wrong cables. Cables also soundstage differently. I've listened to cables that place the vocalist behind the drumset and others which have the same vocalist in my lap. Some accentuate certain frequencies. One size fits all is not a synergistc approach. Having all components sound their best as one system is actual synergy.