Thank you for the posts, Mr. Dixon. I don't doubt that by changing a few things about the way to control a bike that the Spongy Wonder can be used quite effectively.
Like recumbent bicycles, the saddle your company makes seems to elicit two kinds of reactions. Riders who have had problems with traditional equipment and find a rather radical solution tend to rave about what they've found and recommend it for everybody. And that elicits a strongly negative, fault-finding reaction from those who prefer the more traditional ways of doing things.
Personally, the Spongy Wonder is not my cuppa Joe and I'll always chuckle a bit when a bike equipped with one comes to my repair stand, but if it keeps more people riding their bikes, then more power to it.