Product review (4 stars): Works
We were getting bad smells in the laundry room.  Things that I thought:
Mildew from front load washer - we leave it open
gas from sewer line - liquid fired the drain
dead mouse in dryer vent - bought a vent that seals and prevents bugs and cold air
gas coming from septic outside and coming in dryer vent - got this product

This lets me vent the warm hot air from the dryer into the house.  Our laundry is on the second floor and opens into a large part of the home/stairwell.  So I am not worried at all about too much moisture and mildew but if you were in a tight place this might be and issue.

Pros: Works with modification.  I took some painter's tape and sealed the cracks and gaps this unit has.

Cons:
Lever is on the wrong side for our layout.  Sort of a pain but since I'll only switch once or twice a year not a big deal.
Filter is worthless - I put on one of my wifes nylon tube socks and this does the trick perfectly - (NOTE you will have to clean out the sock to keep the dryer drying)

With my mods I am pleased with this purchase.