I've had a Sigmas Evo 3 and PSA P10 side by side. In my system, with the components I had then, the multiwave adjustments on the P10 created various levels of hum on most settings. I bought the Evo 3.I concur with twoleftears. I owned a P20 and had nothing but hum issues. I ended up buying a Torus RM20, which I love. A friend of mine swears by the IsoTek.
