Product review (5 stars): It really works!
We have a dryer vent that goes into our attached garage.  For years, the whole contraption has been unsightly and messy -- we did it the old fashioned way by putting a nylon stocking at the end of the duct.  Recently, when remodeling our garage and putting in new storage units, we decided to give this product a try.  It was inexpensive and we really didn't expect it to work, but figured we had little to lose.  Amazingly, it works just fine.  Somehow, someway, the vent duct shoots the dryer air into the plastic cup that contains tap water and catches all the lint.  But not only does the water catch the lint, but it provides for an unrestricted air flow into the garage which is not only much safer, but also gets the clothes dried faster.  This is a great product and we highly recommend it if you are unable to vent your dryer directly to the outside.