Product review (4 stars): Nice
Easy install, attractive look, and adequate ventilation.

The flapper that is installed inside the duct helps keep air from blowing back in the house when not in use.  This is great for people in northern climates in the winter (your kitchen won't be drafty). The flapper is pretty loud though, and on a few windy days it can be heard distinctly in the kitchen and living room.  You get used to it, but it was annoying at first.  This does not happen constantly, only on certain wind conditions.

It does not have a digital time clock, even though it looks like it does by the controls.  The directions are rudimentary at best and the help desk is not very helpful.

Despite all of these negatives, I would still buy again.  It is priced very aggressively for what you get in appearance and quality.