All three units will block noise and create a more stable environment for the components, the difference is that Isotek isolates all of the outlets to eliminate cross contamination of digital circuits into analog ones.
One of the biggest nasties in audio is the digital clocks and circuits radiating noise into the analog components and addding a layer of grunge and Isotek is one of the very few companies that design their products to filter each outlet from another.
Isotek is also very effective in emi and rfi suppression. We have been selling Isotek for years and when ever we demoed one of their units particularly their higher end ones, the change in clarity and sound staging was very noticable.
We sell Audience, Isotek, Running Springs, and the Isotek's are great.
Dave and Troy
Audio Doctor NJ