I think the thing to keep in mind with scents and calls that they are only effective during a very short period of time duringdeer season. If you hit it right they work to the point you can't believe, and other times the deer pay no attention what so ever. I've had the best success in early pre-rut when the doe aren't quite ready, but the bucks are all primed to find that first hot doe. Once the doe come in it's harder to get a bucks attention when he is with a hot doe already.
Ditto.
I've found there is a short window of opportunity where it seems like everything works. May only last for a few days though.
I can personally say that scent bombs were 100% effective for me in the past. I've had several bucks over the years come into my hanging tinks 69 bombs. Out roaming around in the pre rut and all coming in downwind with their nose in the air.