Most likely there is no desire to understand, it is not intuitively clear how to place all the nozzles on the base. If the dust tank is not removed (the cyclone, fortunately, is removed), then it is a little inconvenient to clean it. Got pros: one battery is enough for ~ 40 sq. m, included 2. The power is sufficient for the carpet. The hand does not get tired. The number of nozzles is enough for almost all occasions. Cons below: Hard candy wrappers can get stuck in the tube-to-bottle junction, preventing the suction and proper operation of the manual dust press.