This is my 3rd InsinkErator. All have been quiet and efficient in processing food waste for our septic tank. The 1st one simply wore out from old age, the 2nd failed while under warranty and I am REWALLY IMPRESSED with the warranty service!!! I would have given 5 stars for quality had the 2nd one not had an early failure. I installed the last 2 myself. Very simple and straight forward installation. It is a bit cumbersome and awkward holding the unit in position while attaching to the sink. I am 85 years old BTW.