For a home?
Or for a resturant?
For homes, people tend to think they are too startling.
They tend to thump the pipes a bit when flushed too.
In a noisy location, you would notice these things less.
At 2:00 AM, next to the Master bedroom, you notice these things.
Or, if you are the guys testing at Consumer Reports, you don't notice at all. Dooh!