Product review (2 stars): Dents Easily
The duct dents incredibly easily. When it came in the mail, I laid it across the top of an open cardboard box for two days until our installation. Just resting on top of the box created deep dents in the two places the duct touched the box's edges. Then pulling it out to the full 8 feet as well bending at a 45-degree angle to get to the dryer vent all created more dents.

It also didn't stay connected to the plastic elbow for the back of the dryer or the plastic piece to connect into the external vent, so we had to buy separate clamps. We're worried about all the dents causing lint backup, so we're actually planning to buy a whole new duct tomorrow--definitely from a different company.