It's really cool invention for lazy people or for these who want to create smart home.
I personally suggest to buy one Xiaomi robot vacuum cleaners, you can get it for less than $300. Probably Xiaomi now offering one of the best robots in the market right new for very good price. Sadly I can't have robot vacuum cleaner at my home because it wouldn't able to pass the doorsteps - it's just too high for him. So, I have to clean my home in old fashionated way...