Hi CHLim,
I own a couple of 2.5M Promitheus silver loudspeaker cables since a few months. I wanted to upgrade my old Monster cables (I don't have them here available now, so I can't tell you the exact model. Anyway I remember they were not exactly cheap.) but was a little bit scared on silver because I was told that it could be too detailed and sound could be somewhat fatigueing. But as I was, and still am, so enthusiastic about their TVC I wanted to try those cables also because I find price acceptable.
In two words I also found this product great! The true is that this silver wire even attenuated some problems I had in the medium/high tones region! They reduced listening fatigue in reality! They are more balanced than the Monsters and also offer a very fast and deep medium/low region. The behaviour in the high region seems to be diferent from copper cables I used in the past. It's very detailed, very realistic (voices are incredible) but definitely not too bright. Would buy again.
Ciao from Italy!