I use an EquiCore 1800 for my sources. I think it's a steal at Walter's sale price. I have 2 dedicated lines plus a new service panel and new wire run from outside but suffer from noise due to old wiring and poor grounding in my neighborhood. The EquiCore provides me with a low noise-floor, and removed low-level buzzing from the mains. I'm sold on the balanced power design which separates the ground from the inverted hot and neutral to provide clean power at the output. Some forum members said I should have gone with Audioquest, I don't have an answer for that.
Now, there's a catch. Underwood introduced the Deep=Core as an add-on power conditioner with extra features and increased filtering. All I can say is "WOW" to the increased power conditioning performance. There's an absolutely black background, something I've never experienced with my system. There's more inner detail and separation between instruments with no colouring of the sound. There's a DC blocker which further cleaned my mains and a cool feature to adjust the bass for the most low-end detail and impact. The price of both on sale was less than the Audioquest Niagara.
To answer your question (finally), I was very impressed with my Equi=Core 1800 which I used without it's companion for about a year. I never regretted the purchase. It definitely brought my system to a higher level.