"Steve W." wrote:

Does yours have the metal gears or the plastic ones? They are
interchangeable but the metal lasts longer (although it is a bit
noisier) especially if you run the dough hook a lot.

That and the
housing color is what separates the home models from the smaller
commercial units.

Well, and the price. All the Kitchenaid branded units are really
consumer models, the only real commercial unit that size is the Hobart
branded N-50 at $1,600.