Are Shakti Stones effective?

I have never used Shakti Stones and wonder if they really work and, if so, what do they do,  I have used the Shakti Holographs and found them to magically focus the sound and tighten the soundstage. From what I have heard, even from Shakti, is that the stones make a significant difference is some usage and less in other. Has anyone used these and what do they do?
In the SMc Audio VRE-1 manual, Steve McCormack has a section devoted to power cords, interconnects and devices that owners might wish to try with his preamp. Among those items are Shakti Stones. 
I don’t know a more skilled audio equipment designer/builder and acute listener than Steve McCormack. 
Some end users may have less issues with RFI/EMI than others. This should be taken in consideration before making a proclamation against any product designed to address those issues.
That's an insult not an argument. He would know the difference- but then that would be one thing he knows, and if there's one thing I know for sure its that he knows nothing.
Depends on were you use it.