Robot vacuum cleaner at maximum speed. Here and power, and an advanced application, and self-cleaning, and an optimal form. D-shaped robotic vacuum cleaners clean well along walls and in corners.
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Pros
Design, D-shape. There is self-cleaning, you can not remember about the robot vacuum cleaner for a long time. Great power. There are rollers, not brushes.
Cons
If you already decide that you can spend so much on a robot vacuum cleaner, then there is nothing to complain about that it is expensive) And there are no other minuses in it, only the price. But objectively, the price is adequate, if you take the functionality.