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I purchased this to replace a generic blower that was used to evacuate the humid air out of the shower. I can say that the air volume increased over the manufacturer's one. But, the noise level is just as loud as the old one. The frequency of the noise is just higher. I even used Dynamax sound pads under and over the new fan and isolated the feet on rubber.
So, for what it's worth, the fan is a better air mover but it shouldn't be labeled quiet.
Update a year later. It's still loud but it's growing quieter. Almost like the bearings needed to seat in from use. I'm adding a star for the air moving ability. It really helps with mildew and to dry the shower. The price is going down as well making this a good purchase if noise isn't all that important to your installation.  Mike from the Lifesaport liveaboard blog