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Originally Posted by OmarGC
To this day I've never seen it
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That's because it doesn't exist. The advantage is silence and a little less drive-loss as mentioned above.
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Enter Rotrex.
They came up with a planetary setup that doesn't use gears. It uses roller bearings, so you get the best of both worlds: no noise and no thrust load.
Because of the extra efficiency, the gearing can be more aggressive, which gives the Rotrex a huge advantage at lower rpm.
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You need to think about this a little more. The reason for the huge internal step-up gearing is because they use a small impeller. It needs to be able to spin to 6 digit RPM numbers to deliver the airflow that the other manufacturers get with a larger impeller at half the RPM. This isn't some huge advantage, it's just a different design.