Anybody have any experience or understandings they care to share about any of these newer grinding wheels? I run greenteeth on my rayco 1635 super Jr. They're great. I'm just curious how they put out so many so quickly. First the greenwheel then the quadwheel then the reverse s .. What gives?? Does one wheel work better on a certain hp rated machine or maybe in certain areas with lots of rocks they want less teeth to chnage(greenwheel only has 6)..or maybe it's just a reinventing the wheel experiment? What do you think?