This review is for the PLPlus C, the current version.

When I first added this to my tube system, I was somewhat flummoxed as to what I was hearing and then
I had one of those inspirational moments: it involved what I wasn't hearing. The Linear Line Filtering removed
all the remaining vestiges of sibilance and blur that was filtering through the power supply on my tweaked
out Dynaco Mark IIIs. This reduction of quantum 'noise' opens up the soundstage considerably and
increases the detail. What a gift for only $162!

I purchased this from SweetwaveAudio.com, which is an excellent place to buy some of the more
exotic tweaks to any system, acoustic treatments and effects processors. It is run by Peter Fiori, an
Uber-nerd of the first order of magnitude.

The PL-Plus itself is quite heavy @ 14 lbs and has a little bit of frou-frou on the front bezel, but it does enhance the appearance a little even if it doesns't serve a purpose.