I have killed MORE deer with my Scentlok on than without it on.
Not just that, but I've seen more deer, and had them come right underneath me and not smell me. That didn't happen before.
Is it the 'be all, end all' of scent containment? Of course not. You still have to play the wind and use your common sense. But properly used, and used in conjunction with scent killer spray, and showering with an odor neutralizing soap, it's gotten me better results than years of not using it.
What it also does for me is give me some wiggle room if I make a mistake on my scent containment somewhere. When I was with a hunting club that had a bunk house (but no working showers), we wood stoke up the wood-burning stove, cook all kinds of crap, some guys would smoke cigars, and then we would go to sleep. And going into the woods the next day smelled like the cabin coming into the woods. Even when i left my stuff in the truck overnight, my hair and skin reeked of the smells of the cabin.
However, using the scentlok helped with the odor problem...
Just my experience.