honestly stand by their stuff. True it does have a build up if someone coats the stuff on over and over and over again. Have you ever utilized it first hand? I've seen it on a set of corvette rims and they help up pretty nicely for the last 5 months. His rims look very shiny, but if you can't afford to sacrifice an almost un-noticable change in shine and want to waste and hour of cleaning on each rim... that's fine.