Why iRobot Roomba 870 is a dependable vacuum cleaning robot at Rs 62,900

The iRobot Roomba 870 is the size of a large frying pan and stands about 3.6 inches tall and weighs 3.8 kg.
My first encounter with a robot was the LG HOM-BOT vacuum cleaner a few years back. Strangely, even now the one functional robot you can bring home is a vacuum bot, and they are getting better. iRobot has been a leading player in vacuum cleaning robots in a host of models. While the small Indian market has predominantly been the domain of LG and local players like Milagrow, it seems iRobot