I own a KitchenAid 6 quart Professional mixer with 525 watts of power and purchased this grain mill so we could grind our own wheat for bread.It was a complete disaster. Not only does it completely stress out the mixer but it does not grind nearly fine enough for flour. Following other advise to run the grain through 2 times, we filled the hopper with the berries and before it finished (on medium grind) the mixer was so hot we had to stop the machine for about 45 minutes. Trying to run the medium grind to a finer grind totally cooked my beloved mixer and broke the bearing before the grinding was complete. (We did have the metal gear box but that didn't stop the damage that this mill did).I agree with most of the reviews here purchase a real grain mill and save your mixer!