I've never seen or heard about these things.
It's sort of a stealth mini-beam design.
I'd love to see a saddle forces comparison of this product, suspension seat posts, and beam bikes (i.e. TREK Y-Foil, Softride, and Zipp).
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WTB: Slingshot bicycle promotional documents (catalog, pamphlets, etc).
WTB: American Cycling May - Aug, Oct, Dec 1966.
WTB: Bicycle Guide issues 1984 (any); Jun 1987; Jul, Nov/Dec 1992; Apr 1994; 1996 -1998 (any)
WTB: Bike World issue Jun 1974.