I run mine on Max(550rpm) with the Nils Power Point head with no issues. It frigging shreds the ice. 2"/second maybe. It's just stupid-fast cutting and smooth too. That's with ZERO down pressure too. My hands just stabilize the auger and keep it from spinning counter clockwise. I think an awful lot will depend on what auger you're using and how sharp it is. Ice Scratcher just found out the hard way that running an auger without a centering point at high speed was a bad idea.
