Product review (3 stars): Great Idea
We tried this product because our exhaust to outside is approximately 40 feet.  The appliance technician measured the air flow from the dryer to the outside and found a significant drop.  We decided to see if the indoor dryer vent would improve the drying time.

The item worked well.  Except the dust was unbearable and caused us to try using a stocking to contain the flying lint.  Of course, this reduced the air flow and we had to remove it.

This product should go further and provide a filtering system for the flying dust.  We could get used to the noise, but the dust needs to be contained.