Product review (5 stars): quiet, flexable, and not ugly!
I use this as an exhaust vent. I replaced metal ducting that was fixed and a hassle to deal with. Not only is this much more easy to deal with, but it also reduced the noise from the fan DRASTICALLY! If you need ducting in your house, or anywhere else where you don't want it making a ton of noise and looking ugly, then this is for you!