Forget the UO; go for the P300! I mean, if you think about it, your source components are the ones that really need the conditioning because, presumably, these things are "broadcasting" the signals from downstream; the amp will just amplifier whatever they pick up from the dirty ac. When I hooked up my system to th PS Audio P300, the difference was not subtle. Yes, it really works in that it opens up the sound stage, lowers the noise foor, and it resolves instruments, improving imaging. However, I have found that power cable also play a significant role: I have an Acoustic Zen Tsunami powering the P-300, and it really resolves things over the stock power cord, greatly improving the bass. That is, things don't sound so muddy.