As for whether it works, I'm not sure, I like the smell of the Source, it's a mild scent rather than a concentraited one. I like to think it helps draw attention to the hookbait when first introduced, but I'm sure it becomes less potent after a short time, so for me it's just a sudden cloud that leaks off quickly hopefully attracting the fish in and not remaining on the bait marking it as the odd one out.
I suppose it's like all edges, if you're confident then it'll add to your game, if not you'll forever be adjusting, chopping and changing.