Experience with Inakustik 3500P Power Conditioner??

@nonoise ha I know.  I've seen all the debates about whether this is snake oil, but now I'm just asking for practical ways to really hear the difference since so many people are SO very sure there's a positive difference.  

Less hiss in the tweeter?  

Are they providing a larger power reserve from which the amp to pull from?  

But surely there's some objective evidence to show what these things are doing.  

Can you guys offer some ways to test (without expensive equipment) these claims of lower noise floor etc?

Are you just cranking the volume and sticking your ear near the tweeter?  

How are you judging "blacker backgrounds" when there has to be 10-30 mins between listening sessions as you rewire your whole system?  Can't really A/B this mod.