I have found that scents have made a huge difference to my soft plastic fishing. I've been using S-factor, because I love the Z-man soft plastics that don't have any added scent. The combination of the two gives you a really hardy re-useable lure. Even when tailor are thick, the z-mans will survive a dozen fish or so. I know people who use Sax, and Procure. They have differing opinions, but most are around how easy it is to apply, and also the relative costs. In some of the areas that I fish, the before and after particularly with bream isn't even close, scent definitely makes the difference. I was being stubborn before, taking the view that it was lure fishing and was all about tricking the fish with movement etc. Well bullcrap to that, I'd rather catch 18 bream than 6 any day, and I think the difference is of that scale.
Matt