Some pros: As a spectator, I find it to be fairly satisfactory; I can either sit close to it, at which point it operates at speed 1, or two or three meters away, at which point it operates at speeds 1-3, and this is sufficient. As a heater, it is fantastic; it warms the entire room sufficiently quickly; the noise level is tolerable; and you can sleep with it. Having this drawback: Even at speeds more than 5, the noise can still be heard clearly enough for one to take notice of it.
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