The unit is beyond quiet, I can only tell it's running by the red light shinning on the ground.  It works great - small yet mighty!  Having an 18" DW isn't ideal, but if it's what you also need for your space this one is worth it.  Only complaint (other than the cost) was setting up the unit and having to connect it to wifi before running it.  I am tech savy enough for things like that to be easy and it was the BIGGEST pain to get the DW to connect to my phone/app, and I couldn't run it without connecting it first (which is frustrating).  And now it never connects to my phone but can still run it just fine, haha.  I'm not sure why it was not connecting but it was hours and very frustrating.  And if someone doesn't have a smart phone, or is older and not tech savy, how would this work?