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?
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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 :-)