Spore formers in probiotics

I have just bought "Complete Probiotics" from Dr. Mercola as he recommends them above all other probiotics because they contain Sporogenes - a spore former. But I have just found this article at
http://quackfiles.blogspot.com/2005/05/primal-defense-hso-probiotics-warning....
which claims the spore formers could be dangerous and almost impossible to get rid of once established in the gut. These spore formers are also in "Primal Defense". Please, does anyone have long term experience of Primal Defense, Complete Probiotics, or any other probiotics containing spore formers which can reassure me that they are not a problem? Tweet