Product review (1 stars): Blech.
The water noises are disturbingly and annoyingly loud. Sounds like someone taking a shower in the middle of the kitchen. Or like it's raining. If you can, buy the version made in New Zealand by Fisher & Paykel. Which I have in my other house. They look almost exactly the same but the F&P-made one is so much quieter and smoother operating.

UPDATE (Jan 30, 2012): After three weeks I exchanged the KitchenAid for the similar Fisher & Paykel model, which I've had for over three years now with no problems.