Insanely quiet. I really wish it pushed out a little more air, but I think that's a compromise to make for a fan this quiet. Very professionally packaged. The only thing that really bothered me was how difficult it was to use the included rubber snaps. They weren't stiff enough to fully fit through my case's openings and fan corners. No matter how hard I tried, they never went far enough to provide the support needed to hold the fan. In the end, I just screwed them on like a traditional fan, since the rubber corner bumpers that came with them help to muffle contact noise anyway. In general I am very satisfied with the product. Well done Noctua.
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