Airfree Tabletop Air Purifier for 650 Cubic Feet

Not sure what to think or write. The top does get hot as it is supposed to, but it worried me for a bit. I prefer it with no light on the top - that may be because I am a senior, not sure. The light on top is bright and can definitely serve as a night light. There has never been residue under it and I don't think that that is because the place had/has great air quality. No improvement in my allergies, but it does seem to help with the neighbour's cigarette smoke/smell that seeps into my unit. Love that it doesn't make any noise.