I now have 4 Purons in my system and found incremental improvement with the addition of each unit. They make for a quieter background that allows more clearly defined, three dimensional images over a broader, deeper soundstage. They also allow more musical detail to be revealed while at the same time making the sound more relaxed.
I have also replaced purple fuses in all my components with the Swiss Digital Fuse Boxes and found some of the same improvements as the Purons, but even more impactful was an increase in dynamics.