I have a Whisper and cannot recommend it... it definitely does not live up to its name!!
I have my air pump on a timer, it comes on at 9am, off at 5pm. That way I can feed with it interfering AND enjoy the tank when Im home from work without the annoying hum/buzz.
46 Gallon Bow F/W: 4 - Zebra Danio's, 2 - Red Platy's, 2 - lg. Silver Dollars, 1 - Pleco (4.5"), 1- Gourami, 1 - Cory Cat, 1 - mystery snail, 4 - Cherry Barbs, 1 - Black Molly