Puritan PSM156

I can't speak to the ups and downs with the Puritan, but with the Niagara 1200, the top end wasn't as resolving of the faintest swirls of air in the high end until about 4-5 days of use. After that, going directly into the wall proved no difference in that respect.

My test track for that is the Main Theme music for The Revenant, where between the mass strings, the ghost like winds that blow and swirl between them are a great test for that. 

Everything else improved as well, exposing more and more detail and nuance. I really can't detect anything else since.

All the best,
Nonoise

I considered getting one but the price you pay here is more than if you bought it directly, which I don't know if you can as there's a stateside dealer. 

I went for the Audioquest Niagara 1200 and couldn't be happier, at what would amount to around half the price.

Here is a very favorable review from 6moons: https://6moons.com/audioreview_articles/puritan/
and one from Paul at The Audiophile Man:
https://theaudiophileman.com/psm-156/
and one from Stereo Times:
http://v2.stereotimes.com/post/puritan-audio-laboratories-psm156-power-conditioner/
Hope that helps.

All the best,
Nonoise