I bought a model 400. I recommend it. Unlike 400-4, it only has a speed knob, it is also a switch. Spin and everything works, and do not turn into a washing operator. There is no Amazonator in it, but it is not needed. The ability of the 400-4 to turn off the ionizer and UV illumination looks strange, as if the vacuum cleaner had another button to turn off the engine.) The air has become cleaner, all the dust has disappeared in the rays of light. Evaporates 4-5 liters per day at medium speeds. A few drops of essential oil in water and the house is saturated with the smell of eucalyptus for a couple of hours (lotus oil, brought 10 years ago from Egypt, smells like 5 hours). Inside there are 2 quiet fans of 120 mm. In the first quarter of the regulator, only a squeak is heard. I change the water every 2 days. I drain the remains of a yellowish color (at first they were very yellow).
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