I like the setting choices, I settled on smart mode and as the heat from my receiver increases you can see the indicator light

I use smart mode so it only runs as much as necessary.

I leave it in smart mode at 1/4 power, and it's basically inaudible and provides probably more airflow than the amp would get in free air

I am currently using Smart Mode and set the fan to max out at about 3/4.

I love the intelligent mode where the user can set the fan level and let the system keep the heat under control automatically.