I'm very skeptical of any dealer's "review" of anything because they want to sell them to you. I'll wait for a real world review by one of the inmates.
As far as I know, more silica would mean faster wear - better traction in the wet but they should wear out faster because of it. My full rains that are loaded with silica basically vaporize in the dry. Also, the tread pattern might clear mud but it looks like the front end would slip sideways due to a lack of lateral traction in the muck. Just my 2 cents.