First off, I've had a Kitchenaid Pro 600 stand mixer since 2001. It's been a workhorse but lately it seems the motor slows down and is unable to knead/mix bread dough on its suggested setting of #2 and at times the housing got very hot under a normal load. It just so happens that on a recent review of stand mixers on Cook's Country that a 7 quart Kitchenaid was number 1, with the proviso it was expensive. I don't have a problem paying for quality and after doing some web searching learned that the KSM8990 8qt mixer was KA's top of the commercial line without going to 20qt and up floor mixers which was not what I was looking for. After about a full day of checking reviews (whew) I decided on the 8qt KSM8990 in Empire Red color. (we all know red appliances work better) After unpacking and washing the bowl and attachments (which are all polished stainless steel) decided a double recipe of sweet bread dough was warranted (and I wanted some cinnamon rolls anyway) This recipe calls for beginning with 10 cups of flour with a possible total of 11-12 cups. Dumping the ingredients in the cavernous bowl I started the mixer up on #2 setting. I wound up using about 11 cups of bread flour and the mixer never missed a beat, keeping the speed steady as I added the final cup of flour. The mixer is very quiet and the soft start works great, doesn't kick out flour like my old mixer.
Based on my initial use of this mixer, I can say that I love it, glad I bought it, and looking forward to using it for a long time.