Has anyone tried the new product "speedzone" from PBI Gordon. One of the active ingredients is a new one (at least to me)Carfentrazone? Its claim to fame is fast kill even in cool weather. I want to try it, but am a little nervous on my overseeded lawns until I get some feedback. Called local PBI dealer and they were clueless! Any feedback on this product would be great! "The Turf Doctor"