Product review (4 stars): Whisper Quiet...
VERY quiet...and that's the maint reason I replaced my old Insinkerator 777. The KitchenAid does have a little low frequency vibration(I think they all have some)...but it's negligible. I researched this purchase on Consumer Reports. This unit was the best rating combination of quiet, effective, and low price. Would have given it five stars if were better balanced...but I'd buy the same model again...REALLY quiet!