I bought this to replace my 30 plus year old KitchenAid stand mixer as I was ready for a color change. It's still a great mixer but I was disappointed as the quality control is not what it used to be...apparently when they were making the bowl there was some flaw in machining the bottom threads of the bowl that screws into the base plate. Everytime I've used it, the only way to keep the bowl from becoming so tightly jammed into the base plate that it impossible for me to remove the bowl myself. I had never had this problem before and then a friend who had to help me remove the bowl pointed out that the threads on either the bowl or the base plate were defective.
UPDATE: I called KitchenAid Customer Service and they promptly sent a replacement for the bottom plate...glad I bought KitchenAid because while there was a mistake in machining this item they were really "on the ball" in terms of getting it fixed. Works GREAT now. Get more detail about KitchenAid KSM150PSER Artisan Series 5-Quart Mixer, Empire Red.
