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Blister has revieews of both the 191 & 186, they also have a comparison between the BG and the S7.
191 -
http://blistergearreview.com/gear-reviews/2011-2012-on3p-billy-goat-191cm
186 -
http://blistergearreview.com/gear-reviews/2010-2011-on3p-billy-goat-186cm
Comparison -
http://blistergearreview.com/gear-reviews/2010-2011-on3p-billy-goat-186cm/3
If you want a short review of the S7 check the blog quoted in my sig.