No credible evidence (meaning that we can't take for fact testimonials) for or against. Looks like a wash to me.
As far as people taking Miracle-Mineral-Supplement and not feeling better, I would assume that they would do what people who take the myriad of other cures on curezone and don't feel any better. Stop and try something else.
As far as your motives for having a "debate" forum for Miracle-Mineral-Supplement , I am not convinced of your "altruistic" motivations.