If you go to the website high-endaudio.com and click on "recommended components" and then click "accessories," you will find a brief but useful analysis of the relative strengths of the Powerplants and their possible weaknesses. The author's opinions pretty well mirrror my own. I have a p300 with multiwave I and can't comment on the relative merits of multiwave II.
ps audio powerplant benefits
I have considered getting into one of the ps audio powerplants based on good reviews, etc. They offer several different products, however. Could some experienced users please comment on the benefits of multiwave 2 vs the original multiwave as well as the new cleaning feature. They also offer some filtering products as well, so any opinions on these would be welcomed as well.