My previous Rubik was 9 years old when the CBO began and began to rise in price and disappear from the sale of equipment. Therefore, we decided to buy a new one, while there is an opportunity, and send the pensioner to the dacha. I considered other manufacturers and concluded that the Koreans have more intelligence, and this one has more brushes. Unlike its predecessor (some kind of 6 series), it is possible to set up a schedule. For me it is very convenient - it makes noise and crawls when everyone is at work. The purchase is satisfied.