Scent-Lok: Waste your money, on something that doesn't work.

My .02 would be to pick the day with the "best" wind you think you are going to get and just hunt it. Who know what direction the wind will come from an hour after you get to your stand anyway.
Watch the weather as the season approaches, and see what the wind does at that stand when there are certain weather, or wind, pattern going on. You might get to the point where you can predict the wind direction at your stand pretty well without even showing up there.