Plugged it in and it seemed like almost no air was being moved. Boy, was I wrong. Laptop now run just as cool as if it was powered down.
I have it set up in an office that has another fan running 24/7, and do not notice the sound of this at all. Could be different if in a room which is silent, or while you are trying to sleep. Does have a separate power switch so you can power it down if needed.