Hi, reviving this thread with a few comments. I own two 3500P's, both supply power to entire systems with DAC, Preamp and mono amps.
I am very happy with the sound. I got a huge improvement by upgrading the main C20 power cord to Audience AU24 SX. (it came with an upgraded Inakustik cable, but not the Air model). I have a dedicated 20 amp line on one system, not on the other. I keep them on all the time unless leaving for long weekend or vacation. The times I have had an electrical storm it disconnected immediately.
My only criticism is the tightness of the outlets on my plugs. All my very nice power cords tend to 'droop' a bit, as they do not seem tightly clamped. I have come to 'prop them up' so that the weight of the nice cable does not cause them to droop. On occasion, while moving something around, one has come loose enough to not connect. Since this is a power conditioner, it troubles me that the 'power connection' may be less than stellar. Ken