I have never..ever...ever...shot a deer over scent. I had just about given up on them until some provinces banned the use of them (which is usually the best indication that they work). But I don't plan to buy any again.
I've spent a small fortune on gadgets and gizmos over the years; some were useful - most weren't.
My advice...do your scouting... Pick a spot where there is clear evidence of deer activity (the more recent the better), keep the wind in your face and SIT STILL!!!
Understanding wind currents and thermals in hilly, broken terrain can often be incredibly frustrating. I've found that collecting and storing milkweed seed pods during the late summer has made me a better hunter in the bluff country that I hunt. These little feather like seed dispersers will float on the lightest of air currents and will show you what the wind is not only doing right at you're location but more importantly down range. I like to use the off season to float them...