Smaller plug-in AC Purifiers -- Shunyata, iFi, Puron...something else? What do you like?

I have added power conditioning incrementally. I find it easier to take it out of the system after it burns in to be able to hear the loss of it's effects. I Have 3 dedicated 10 gauge 20 amp circuits. I added Shunyata defenders more for protection, but they made very subtle improvents. I added an Everest which was great. I then added two Purons. They made a very nice improvemnt that was easy to hear when I pulled them out. I then ordered 4 more Purons. I now run 2 Purons and a Defender for each side of my Gryphon Stereo amp(two different power cords needed) as there are four outlets per circuit. I then run 2 Purons in the bottom two outlets of my Everest. These all compliment each other and the Purons especially improve imaging and the wee edge that appears now and then. I recommend Purons. The Swiss digital fuses were also an improvment over the four SR Purple fuses they replaced. 

Orthomead, is the Rhodium a slug from Mark? Where are you seeing slug options? I was thinking that tuning slugs would be cheap and a lot of fun, but don't know where to buy them!!! Thank you for your comments. I can see a future thread where we share slug experiences.