The too-hot slow cooker with the rattling lid because the contents are boiling was getting really old, so I read a review of slow cookers in Cook's Illustrated magazine.  The KitchenAid was rated at the top of the list.  The temperature settings are rock solid, there is no boiling instead just very steady slow application of heat which is the base requirement for a slow cooker, but you'd be surprised how many can't maintain a steady temperature.  The bowl is super thick and heavy so distribution of heat is efficient.  Love the easy to use controls, I haven't used the timer yet, but have used the cooker about  5 times since I got it and absolutely love it. Nothing bad to say about this remarkable appliance.