i have one, and for the whole house surge protection its worth it. its a tough product to A/B (as you have to leave the house to do it!), but when i did the install i will say i noticed less up & down w/ afternoon power...not cured, but better.
power has 2 probs as i understand it:
1) diff noise (between hot & neutral) aka traverse noise aka normal noise---think switching PSs on grid, and incoming trash from the street
2) common noise (between neutral & ground)---think EMI/RFI
any power solution has to treat both. the EP goes after #1, which is IME tougher to treat. power is so so hard to get right. i've the EP2050, Maher CBFs, DIY R-C networks, dedicated lines, Oyaide R1 / WPZ outlets, high $$ power cords, a Weizhi distributor (great product)...and each one made an improvement. and the difference between good power and great power is more valuable than trading up several grand in components.
power has 2 probs as i understand it:
1) diff noise (between hot & neutral) aka traverse noise aka normal noise---think switching PSs on grid, and incoming trash from the street
2) common noise (between neutral & ground)---think EMI/RFI
any power solution has to treat both. the EP goes after #1, which is IME tougher to treat. power is so so hard to get right. i've the EP2050, Maher CBFs, DIY R-C networks, dedicated lines, Oyaide R1 / WPZ outlets, high $$ power cords, a Weizhi distributor (great product)...and each one made an improvement. and the difference between good power and great power is more valuable than trading up several grand in components.