Kickers may just be a bent piece of rubber, but often the simplest things in fishing have the biggest impact, and these will help improve the hooking potential of a multitude of different rigs.
The bent hook set-up was incredibly effective at taking a hold in the mouth of a fish, but also caused a lot of damage, and so for years anglers have been using pieces of shrink tubing to replicate its effect. Kickers take all the hassle out of that, as they give the same effect but by simply sliding one over the eye of your hook, rather than having to mess around steaming anything.