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stevehoggbikefitting.com/bikefit/2011/09/all-about-smps/ explains the thinking behind them.
Steve Hog mentions here that sit bone spacing isn't everything, some people rotate forward needing a narrower saddle (plus a cutout for your junk). I've always suspected this, it's nice to see it written by someone who knows what they're talking about.
miro_o
http://www.stevehoggbikefitting.com/bikefit/2011/09/all-about-smps/ explains the thinking behind them.