I have had several PS Audio units. They are well built and have had a positive impact on the sound as long as i did not try to run a amp thought them. The last one a P10 i still have, but no longer use. I now use High Fidelity MC 6 Hemisphere half the price and a much richer and detailed sound than what i got with the P10. The Hemisphere is for front end equipment only ( no amps). I gave up surge and spike protection, but the sound was much better with the Hemisphere.
Good luck
Pete
Good luck
Pete