Product review (5 stars): Does a great job and is pretty quiet.
I put this in my Mom's house to replace the old 100cfm fan. She really likes it.

It is very quiet on low (100cfm) you could walk away and leave in on all day without noticing. If the room is dead quiet you can hear it easily, but with the tv on or general kitchen mayhem you won't hear it.

On high (300cfm) it makes some noise but you can still hear people talking to you while you are standing by it.

Really keeps the cooking vapors cleared out and keeps the front of the cupboards much cleaner as well.