I have seen this story on quite a few places, I believe it is true.
As for the roughness / headbanging, Vekoma should put the "vest" restraints on their SLC's, just like on Stealth. Modify them so that you would not need the additional leg bar, and headbanging would be a thing of the past. The Stealth vest restraints are very comfortable (for me at least). They are probably more expensive, and no ROI for any people involved, so it most likely will not happen.
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So you want a coaster in your backyard? I hope you have a big backyard.