Just wanted to share that I found a great deal on the Kitchen Aide Pro 600 Series 6 qt mixer today. Normally $500, I got it for $279 plus free shipping on Amazon today. It's just the silver one though, not the cinammon gloss one. 
How do you like them? I was reading the reviews and most were good, but there were alot of bad reviews too about the motor burning out quickly. But I was thinking that was maybe from thicker doughs, like bread. I'll just be making cake and cookies.
I bought my first pro 600 5 years ago, I used it mostly for frosting, and a little cake mixing and cookies. but last year it started to fail, the speed would go crazy, even set on #4 it would go very fast and the motor would overheat and the mixer would turn off. I think it was due to lots of powdered sugar flying in the air. But in December I changed the speed control electronic board and the sensor and it is working just fine. I bought the replacement parts also in Amazon.
And since I have an old KA 4.5 qt mixer (12 years) I decided to retire her and bought my second pro 600, the empire red was about $240.-
I really love them, I couldn't bake without them. Maybe some of the bad reviews are from people who don't know how to operate the mixers.
Good luck with yours!! 
Cookie dough seems to be harder on the machine than bread dough. Maybe because my bread recipe is smaller (4 cups flour) than my cookie recipe (6 cups).
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