I have two pairs of Signalcable ICs, both in RCA, one is the cheaper set and one is the more expensive "reference" set.
The Reference IC easily bested my Transparent Musiclink 100s, more musical mid, warmer, solid bass, a little less brightness, but nontheless open highs. I havent A/B compared the cheaper set yet.
I also have signalcable 12' speaker cable(non biwire), nice quality, sound is very comparable to my Transparent MusicWave 100 speaker cable. Transparent has brighter highs but weaker bass, the Signalcables have solid detailed bass, a little less brightness, I have A/B'ed the combo and it is close, I think the signal cable needs a little more run in time.
I am running both cables in a shotgun config, and it is working very nicely, to my surprise. The Transparent's on the high/mid and the Signalcable's on the lows. I plan to do some switching and testing later.
I use Signalcable's power cords on all my amps, and subwoofer as well. I never new my sub could make such prodigious bass.
I would say that all the products that I have used from Signalcable were an excellent value.