"An easy-to-use design with a misleading claim that creates a dusty problem."
The '320 sq ft' coverage claim is an untested ceiling. In a dry home, this unit's actual output will likely only suffice for a small to medium bedroom, not a large living space.
This is a good value for someone looking for a simple, quiet humidifier for a small room who is willing to use distilled water. The top-fill design and easy-cleaning access are major convenience wins over other budget models.
Anyone with hard water who intends to use the tap will be cleaning white dust off every surface in the room. If you need to precisely control humidity in a large room, find a model that specifies its output in mL/hour.