One thing Tonerite DOES do, is wear out strings prematurely…….even Elixir's…..Some folks claim, (I've not seen evidence in my guitars) that it also speeds up the wear of the bridge plate, as the vibrations cause the ball ends to "gouge" the bridge plate prematurely, in other words, sooner than regular play would do…..just a thought…..I like mine. I find it works better with Rosewood B&S guitars, almost does nothing for all hog guitars…..I use it just before I change my strings….My friend has it on his vintage Roy Smeck ALL THE TIME he is not playing it….with no problems, and he claims it has opened up greatly