Product review (3 stars): Flimsy but so far effective
As others have mentioned in their reviews, this thing is really quite flimsy. But I will say that it has worked well for the 2 weeks we've been using it. The vent it covers is on the third floor when the furnace is on the first. So I could see problems if the air was more forceful. I'm giving it three stars because the cheap nature of the product concerns me for long-term use