"Floorplanner"? Nice try Bob. And I have 5 P-4s, but who's counting, right? (and 5 less wall-warts...)
In my case, it was time for a change. My system is much quieter and more neutral, therefore more natural sounding and resolving than it has been before. This is with very few hours on the P-4's so I'm pretty sure it will get even better after a few hundred more hours.
All systems are different - these have just been my recent experiences comparing the HiDiamond with SR power cables. I have absolutely no desire to try the new version of SR pcs complete with "tuning bullets" and MPCs. My preference is now really just the opposite: to actually HEAR what I have spent many thousands of dollars for, UNFILTERED by "tuning cables" and the like. As I continue to "simplify", and "De-tune", the sound just keeps getting better and better. I wish I had realized this sooner, but I guess its just a part of this crazy hobby as well as a function of the various recent upgrades I've made.