Any suggestions for a robot vacuum cleaner?

Hi everyone, has anyone purchased a robot vacuum cleaner? I would like to know which model and the pros and cons. I plan on purchasing one. I stay alone in a two bhk and currently take care of the house chores by myself. I want to outsource it to a machine as the maids don't really do a good job. Would appreciate the feedbacks. Price range upto 30k. Sweet spot- 20k