Puritan vs IsoTek vs inakustik

I'm surprised by the negative comments I have read about the Puritan 156. I use a Puritan 156 Ultimate which is connected to a Core Power Technologies Deep=Core 1800 that is connected to my wall outlet. The results are outstanding.  All my components are connected to the Puritan 156, including my ASR Emitter 1 Exclusive amplifier which the manufacturer does not recommend be connected to a power conditioner. I have compared the performance with my ASR amplifier connected directly to my wall outlet versus having it connected to the Puritan 156. The improved performance when connected to the Puritan is undeniable - better resolution, soundstage, and bass, and no negative impact on  dynamics.  

Interesting thread.  One thing I rarely see is some type of pre/post measurements of the mains regarding noise, etc., despite the use of some pricey gear in a lot of cases.  Meters like the Trifield or Entech are relatively inexpensive and will display  some type of noise.   

Anyway, my question is whether any of these devices offer any sonic improvement if the power is already pretty clean. In my case, post-treatment using a TriField EM100 meter I get readings varying from about 10-35mV on a 20 amp dedicated line (10 awg). Prior reading were 60-120 mV.  Noting used on the dedicated circuit, but about 8 plug-in G-S filters at various spots in my house.