Product review (2 stars): Not as easy as the videos make out (by a long shot)!
I hate to give a bad review, but I just have to tell the truth here. My experience with this product was not positive.
The idea and concept seemed good, and I was expecting a quick and easy job. It was, however, as frustrating as the old way of trying to attach the standard 4 inch semi-rigid hose to the wall vent.
The instructions to assemble are as follows:
1. Hold snap connector, slide hose towards snap fingers.
2. Push snap connector onto 90 degree elbow until you hear a snap.

This was the first order of frustration. I tried and tried to get the snap connector onto the elbow. It would not go down all the way. When I thought it was finally on, it slid back out a bit. I pushed with all my weight against a wall, but couldn't get it to snap into place and stay there. Several of the fingers/tabs in the snap connector broke in this process.

3. Place clear seal ring around dryer exhaust or wall vent. Push 90 degree elbow assembly over seal ring until snug. Then push dryer to wall.

The only part of this whole process that was easy was attaching it to the dryer exhaust. That actually worked okay (even though the snap connector wasn't tight onto the elbow, as described previously.
When I tried to attach the elbow at the other end to the wall vent I had the same issue that Ive always had in the past, where the wall vent just seems too big for the hose. I struggled to get the elbow onto the vent. When I eventually got it on, again it didn't seem solid and started to slide out a bit.
Eventually, after much frustration, I used quite a bit of gorilla tape to try to secure it in place, then pushed the dryer towards the wall.
Im sorry but I cant recommend this product. There has to be a better way to do this job.