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?
mglik
One would have a real set of stones to argue this one!
I hear that there are some stones from Mars that really improve the sound, especially in a vacuum.  They are a bit costly at over 23 million bucks a piece but well worth the money :-)

I dont know for the shakti stone or the hallograph..... But i create my own devices,with only homemade component, and they worked for improving sound on all count....Peanuts costs....

But people dont believe in their own ears experiments and dont believe in improvement if they are not ready made and officially stamped by a reviewer and costly like the wooden hallograph...

Believe in your own ears and listen.... One experiment after the other....

My best to all....
For me, they work. Significantly.  I place them vertically on my 2A3 tube amps between the power and output transformers. Everywhere else (DAC, SS amp, preamp, transport, music server) not at all.

Those are the only tweaks I use.