Yeah I read about that fan, nothing mentioned it was noisy at all. I like the idea though, spreading some air to the components next to the CPU seems like a good idea but the reviews didn't seem to be as interested in the fan.
Considering Arctic Cooling's other heatsinks and the good job they've done with their fans on my TWIN TUBRO Pro I'd be inclined to believe it won't be noisy. They rate the ACF13P at 300W cooling capacity(very optimistic) and the noise at 0.4 stone(wtf kind of measurement is that!?) which is only 0.1 stone more than my VGA cooler which is completely silent compared to anything else I've used.
For me, because I've used their other products, I'd be happy to try it over the other options. I'm considering purchasing the ACF13P to put into my Aunt's PC to make it completely silent, currently the stock cooler from AMD is spoiling the quality fans on the case I built the system in.