The Xiaomi Air Purifier costs less than half the price and has a 360 degree HEPA 3H filter of the highest filter class which has 99.7% filtration efficiency for the smallest particles (baby and smog mode, included), I would recommend this one, it is also suitable for larger rooms (44 m2 instead of only 23 m2 with the Boneco) and is whisper quiet in operation. The Xiaomi filter also has an OLED display, built-in temperature and humidity meter. The air quality is measured with a laser. It is also much smaller than the Boneco P400: Xiaomi Mi Air 3H (44 m²)