Product review (4 stars): It does the job.
It works well if you are to side vent the dryer. The only reason I gave this product 4 star, is due to the difficulty using this product for bottom venting. The instructions tell you to cut the elbow, but it is a little ambiguous as to where to cut. Also mounting a dryer on top of an already existing dryer duct, then taping the joint is no trivial task.