Once it has been in the house a while, the Core 300 settles into a specific role: a small purifier running near where you sleep or work. Owners who accept that role tend to run it on high most of the time and stop thinking about it. Several own multiples, spread across bedrooms, kitchen and living room, because one unit does not reach far.
The adjustment most owners describe is expectation. People who bought a single Core 300 for a whole apartment, especially older buildings with poor ventilation, found it did little on its own, and the advice that recurs is to add more units, step up to a stronger model, or keep a window open for ventilation. Owners with serious allergies say the small unit alone is not enough to clear symptoms in a room with carpet or mould, and that it takes roughly double the cleaning power to get there.