Summary: Purchased a couple of these to have on hand as replacement parts. While they are very quiet, the airflow is also rather low for a 120mm fan. Haven't received any complaints about my work on a single-core P4-era machine but I wouldn't want to use this for, say, a hot-running gaming rig. The airflow feels about half that of the fan I replaced - but that's the price of super long-life I guess.
Summary: Had this a few months and started getting noisy, turned out to be mostly the sticker in the centre of the fan. It curled out, so, simply peeled it off. That being said, still a bit noisier now than it was a few months ago, and when I put my hand near it I barely feel any airflow. It works... but, airflow is pretty low compared to my old case fan that died after 6yrs (Mascool).