Hello Willie,
well, Sound with Powercords, honestly, a discussion I always avoid :-)
But, yes, I made comparisons with Siltech, Nordost, Oyaide Tunami and Purist Power Cords, also had one from Audio Note Japan for a loan.
The SignalCable Silver PC showed from the 1. Second a wider and deeper soundstage compared to all named above. The Instruments have a better separation, the musical flow is first rate.The higher frequencies had more power and speed.. I did that comparison with an old Decca SXL, recorded in the Vienna Sofiensaal in the 60's, probably the best concert Hall. And the best for checking out recorded details....
I use these with my Lamm ML2.1 Amps and the Lamm LL2.1 / LP2, they replaced Siltech and Purist.
What I recommend to you, when you go for them, ask them to terminate them with Oyaide Plugs for additional price (I would order those like this today). Normally they use Furutech I think, the wall plug is ok, but for the IEC inputs the Oyaide have a much better grip (and contact area).
Well, what can I say, I spent a lot of money, I got in contact with ultra expensive cables, most are not worth their price at all, to make a very long story short. Signal Cable is a light in the darkness of audiophile pricing/performance. Very, very good.