Siltech power cords

For the first time ever I'm considering an after-market power cord. This would be for a Rega Apollo. The rest of my system is a Sim Moon integrated and B&W 704 speakers. Has anyone tried Siltech power cords, particularly the SPK 30?
I'm actually glad to hear that because I have on order a Synergistic Master Coupler.
My experience with the spx 30 that it makes brighter the sound print, but also it seems to be more detailed and to have more speed.