Legendary fans.
Construction is very solid, this is a heavy fan. No frame flex and the blades are very rigid.
Rotor housing is surprisingly dense, there's a lot of momentum available to this fan.
I had read somewhere that these were specially designed to 'change' the typical sound associated with ball-bearing fans. Sounds like they've done it.
It's not silent, but neither is it detectable unless you're looking for the sound on purpose. Its motor has this gentle, low pitched, dull hum that can easily be dismissed, and the wind-noise is nearly absent until hitting very high speeds, very low air turbulence.
Where these really shine is in high-restriction environments (static pressure, radiators). The low turbulence continues, keeping things nice and quiet, and the quantity and velocity of air, even though a rad is remarkable.
1 of these in Pull, is more effective and quieter than 2 Corsair SP120s in Push/Pull on the same rad. The air exits in a straight line, even very close to the center. Other fans seem to scatter air at a 45 angle from just the outside edge of the fan.
Recently EK (watercooling company) released a fan called the Vardar specially engineered for radiators. Fancy, but Nidec has been making nearly exactly that same fan for years, these are them.
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