So far very pleased with my purchase. Product well packed even thought cardboard was slightly damaged no damage to Styrofoam or Winix purifier. I have electric heat and don't know where all the dust comes from BUT with a forced air furnace they have air filters to trap dust which electric heaters don't have so anyone with electric heating and extra dust should get a good quality Air purifier. Clears up cooking oders very well. 4.5 to 5 stars only a couples weeks being used.