Excellent.
The old Hobart KitchenAid's were the best of their time. I am glad that Whirlpool has still kept the KitchenAid brand to a higher standard then their regular stuff.
My Mom and Dad built a new house in 1971 and installed a KitchenAid top of the line Superba (in avocado green, of course. You would expect anything less?)
That was a great dishwasher (it had the soak cycle). They replaced it in around 1991 with a fairly similar model.
I bought a KitchenAid in 2009 and it has been the best dishwasher I have ever experienced. Quiet and efficient.