Product review (4 stars): Best solution on the market
My husband installed this dryer vent to replace the original 20 year old vent on our house.  We're constantly making improvements to the house for improved energy efficiency, so we can't really say anything about energy savings from this dryer vent.

Our perception, though, is that we don't feel drafts in the laundry room anymore.  Big improvement.

More significantly, since it doesn't hang open like the original vent, there is no way for critters to find their way inside the house.  That's exactly what happened to some friends of ours and what will never happen to us with this dryer vent installed.

Visually, the vent is BIG, but you get used to it.  If it really bothers you, plant a shrub!

Bottom line: I'm pleased to have a vent that doesn't allow airflow in/out of the house.  I'm pleased to have a vent that doesn't allow small animals and/or birds into the house.  It only took a few minutes to install with standard tools and some siding caulk.