I'm not going to go into a lot of detail here as I've done that before on other Audiogon Forums regarding power cords and quite frankly I need a break from comparing and contrasting.
I've heard the 5' Matrix (Rhodium) power cord on my Plinius SA Reference amp and it sounded very good, I have no complaints.
I received my 12' Matrix power cord (Gold connections) Thursday and instead of putting it on my Audiodharma cable cooker as I usually do, I put it directly into my system. The Matrix is plugged into a Furutech GTX-D Rhodium Duplex outlet feed by cryogenically treated 10 gauge wire and a 20 amp dedicated circuit breaker. The Matrix power cord feeds my HFC MC-6 Hemisphere that powers my Preamp, Phono amp, FM Tuner, Transport and Dac. Out of the box, the Matrix Power Cord sounded very good. I'm awestruck at the level of improvement I hear compared to other power cords in the same price range. I must also note that it's not a direct comparison since I had previously used a much closer Furutech GTX-D Rhodium Duplex outlet feed by 10 gauge wire and a 20 amp dedicated circuit breaker. I don't think you can go wrong with the Matrix Power Cord, I'm very happy with it.