Scent control works very well to separate a hunter from his/her money to fund another's needs.
Just another unnecessary product being pushed on hunting shows for the sponsors. Watched a show the other day and they showed the hunter stopping to spray himself down before taking a shot from several hundred yards away, and of course they focused on the label. Really?
I think scent control makes sense if you are hunting a small parcel of ground in the eastern U.S. Where you are hunting a few animals that live in a relatively small area and the presence of humans as predators is the primary concern of game animals. Getting winded by a buck in MI/PA might mean he will leave a property for days, weeks or the whole season.
My experience is that I get winded generally less often with it, but it isn't absolute. The thing is it takes a lot of effort and near constant washing while minimizing exertion in the field to make it worth while. I definitely use it in a treestand in Illinois, but don't even bother with it out west because it isn't reasonable to keep it maintained.