I bought the kitchenaid pro 600 series and the first time I turned it on it was obvious it wasn't working right.I ran it on the "stir" setting with the bowl empty and it went so fast I thought it was going to take flight. It ran at this speed for 2 seconds and then just quit, it does nothing if I turn the speed up higher. If I turn it back off and then back to the "stir" setting it does the same thing. I read through the whole manual and didn't see anything about this being a "feature".The lemon goes back tomorrow.