I' ll bite, They looka a lot like the ShockBlockers offered on the G2 and G2xl. Although the saunders don' t move. I' ve read in several threads where owners of the G2 had taken their shockblockers off and traded their cable slide for a normal one. Why? I don' t know. It looks like a good Idea to me.
The Saunders model, being non- mobile, looks like it would maximize the brace height of any bow as it would cancel out any forward movemant of the string past the idle position.

The only downfall I see at the moment is the weight that large looking chunk of rubber must add.

Why don' t you try one out and let me know how it works