I have the PCPnC 850W... Rails are way off (~3.5%), some are even "unstable" (current is bouncing up and down all the time... fluctuation it's called?), I've checked with a MM. Noise level is way off too (extremely annoying buzzing sound, high volume "DBA" too!).

Honestly, I think you'd be happier with a quiet Seasonic/Enermax/OCZ (whichever's your favorite).