I will vouch for Don (Virgo_ref). He is an upstanding guy who is a real pleasure to deal with. No harm meant with his post. He has an outstanding product that he is proud about, as he should be. His support has been fantastic.
I first heard his power cables at Jayctoys place, and they transformed his system. I tried his Ref-1s on my system (with his trial period, why not?). I ended up buying two of his Ref-1s.
The Ref-1s have added a palpability, a presense, a naturalness, and dimensionality to my system that wasn't quite there before. Bass is tight, not overblown, highs are extended, and the midrange is truly wonderful with the Ref-1s. I would have never thought that power cables can drastically alter the sound of a system, but they really do!
There are times where I have second guessed my purchases (too many, for sure), but this isn't one of them.
Of course, the usual disclaimer pertains: system synergy is key in anyone's system, and while these work great in my system and Jayctoy's and a few others, ymmv. With that in mind, the DCCA Ref-1s are worth a try with the no risk trial period, and they will compete with the Shuns, Elrods, EGs, VDs of the power cable world, at a better price.
Second disclaimer: I'm just a happy customer of DCCA, no other ties.