I've seen these mentioned here and there and am wondering if they would be worthwhile. I live in suburban Phoenix and while the electrical in my cookie cutter house is not awful (no noticeable hums or sudden loss of power etc), I have pretty much all my gear plugged into 2 outlets / power strips in same room and am wondering if using a power conditioners for some/all of the gear might yield some positive results. I'd appreciate your thoughts about these units, do you notice positive changes in sound? Only use them as surge protection or for particularly crappy electrical? I see some advertised as giving a clearer/better picture quality for TVs, better sound quality for DAC/amps etc. What I would potentially plug into such a unit: 65" LCD TV Desktop computer DAC / tube headphone amp/preamp / power amp Thanks in advance!