Title: Worthless, even on floor mounted forced air vents
Review: I can certainly understand the complaints from people that tried to use these on forced air vents that were not floor mounted. Since my vents were on the floor I figured they must at least work for my situation. Why else would they even bother to sell them, right? But as soon as the heat came on, the stupid things became airborne and flew right off the vent. Magnetically speaking these things are totally worthless, and I'm back to using old phone books to stop my guest room from stealing too much expensive heat. I can't imagine what these are supposed to be good for.
Is this product review negative?