Nice cooler. I'll be getting one. I am amazed on the 200W thermal test at how the NH-U14S was almost able to keep up with the D15 with its single tower design.
I have 5 120mm Yate Loons all at 7v and have the 200mm fan on low. You can hear a low hum/air movement. It's logical though that this is not a silent case--- the front panel is comprised of ventilated grills. And there's also the huge opening for the 200mm fan.
But I just love the open air...