Product review (5 stars): Unbelievably Quiet...
We replaced our 20 year old in sink erator when the kitchen was renovated.  I chose this one because reviews raved about the low noise level.  I can't believe how much quieter this unit is compared to our old one.  Sometimes you can't even tell it's running... so incredibly quiet!

When it's so quiet you wonder if it's doing its job.  So far no bad smells coming so I assume it's working well even though I don't hear the awful grinding noises that I was used to!