Product review (3 stars): It was shipped in a box within a box, ...
It was shipped in a box within a box, crushed during shipping dented and bent the duct-- could not adjust length due to damage so I returned it.

Metal is very light weight, all joints would have to be duct taped. Collar that attaches to dryer outlet is very short probably an inch long, it was just pushed thru the hole in the duct (not riveted)  was partially out of alignment and out of round

If you could actually connect the short collar to the dryer it would allow the dryer to be much closer to the wall than a conventional hose connection