Product review (4 stars): Does what it says!
Like all the other reviewers have already said - it is not wide enough to cover the entire vent. We used Gorilla Tape to tape it to the metal vent, blocking the airflow and forcing all the air to the Extend-A-Vent. We also didn't need the full extension and cut probably 6 inches off the vent with an exacto knife. The whole process to install took 10-15 minutes with all our modifications. This sits underneath a nightstand, allowing the nightstand to be beside the bed, where it should be and allow air into the room. I agree it is expensive for what it is, but it should last forever the way we have it situated and it does exactly what it is supposed to, so it is worth the cost to me.