Red Sea Max owners

[Skimmin]

I was looking at a red sea max 500 ad. They advertise a silent downpipe/drain. Just wondering if any owners could tell me if it is actually quiet. As in silent. I'm designing a new tank for myself and I'm trying to decide on whether to go with yet another Herbie or try something different. If the red sea drain is actually silent can someone explain to me how it works? I looked all over online but can't find any pictures of the drain inside the overflow, and the red sea site just shows a blurry drawing.