I have three PS Audio Power Plant Premiers (PPP) and for my two systems and my situation which are both Martin Logan systems, it made quite an improvement. Your experience may differ but for me it lowered the sound floor and seemed to increase the overall dynamics of the system. I had a PC8 before the PS Audio PPP and the PC8 sold me on the idea of power conditioning as I have a rather dirty electrical source known as Duke Energy. We have lots of surges and brownouts, sometimes on days when it is Sunny and 75, there is just no ryme or reason to our power delivery. I also get lightning strikes that are close enough that it enters the house and has randomly taken out different things, but not any of the components that I had on the PC8 or that I now have on the PPP. Anyway, I could tell a very noticable difference when the PPP is engaged, the system is dead silent when it is suppose to be and everything sounds crisper, cleaner, clearer if that makes sense. There are other power conditioning products out there and they may be just as good or even better, but I was able to get a great deal on the PPP and IMHO it was price versus performance winner and money well spent.