[eds]

Too little too late, but I have no complaints about my Red Sea deco nano.
Looks nearly identical to your Azoo, down to the white and black foam pads. I've tossed some eheim "cocoa puffs" in there as well.

I have it on my 3g in my office, and sitting at my desk approx 8' away I can't hear anything.

Just closed my door and sat next to it - with my ear about 1' away or less, I can hear a slight hum/buzz. But sitting back in the chair so that I am 3' or more away - general casual viewing distance - can't hear a thing. Of course, I work in downtown Chicago, so there is some ambient noise from traffic outside (30 floors down) the HVAC system, other people in the office, my computer's fan, etc.

Than enough detail for you?