I am always looking for whatever advantage I can to outwit these critters but have never really considered the scent-lok-blocker stuff. IMO it is too expensive and if you do a little homework, you'll find inherent flaws (noisy when cold, carbon becoming less effective with use) that I think make it a poor investment of my hard earned $'s. I would rather rely on proper stand placement, prevailing winds, and reasonable attempts to diminish scent.