I've got a bunch of Black Sand Mark V PC's with Wattgate 330i / 350i terminations and one with the Oyaide 004 series terminations. IMHO, the Black Sand / Oyaide has markedly more sparkle.
Oyaide
I just replaced the plugs on my power cords with Oyaide. The difference in sound is startling. There is just so much more going on. The dynamics are oh so much more varied, and delicate. I don't get that distortion when I make it louder...it just easily gets louder. Great!!!