Sounds like another of those wonder products that catch more fishermen than fish.
I tried all the scents that were on the market several years ago and did not find any that worked better than a piece of dead shad or minnow. Dead shad worked better when I could catch them. Dead minnows were always available as my wife will not use anything but minnows.
My wife adds crappie nibbles to the hooks with her minnows but I have never found them to make a difference. Once I tried just crappie nibbles on a hook and did not catch a single crappie with it. But that could have been due to the problem of keeping the bluegills away from it.
But I am willing to try a new scent once in a while, especially if somebody else has bought it and offers me a spray.
But I suspect in the long run nothing will beat a piece of dead shad or minnow on the hook if you want to add a scent to your jig. (I read where a small piece of cut bluegill works great. I think I will try this the next time I catch a bluegill while fishing for crappie. )