Product review (1 stars): Money wasted.
Elbows leaked so I decided to just connect this using some clamps I had on my old duct. I needed to stretch it out a bit more to reach, and guess what? Tore right down the middle. I needed most of the length and these two 4 foot pieces weren't going to do the trick. Luckily I had one of those foil ducts I previously purchased. $10 foil duct (same company) working great, this one not so much.
-----Update-----
The elbows came already assembled so I seen no reason to inspect how they were attached but after noticing air leakage I inspected them to find some of the plastic flaps weren't connected properly. Fixed this, now there is no air leakage but still dissapointed on how easily the duct itself tore.