I used to own one. I imported my irobot Roomba 560 from Amazon US. Then I bought an adaptor so that I can use the vacuum cleaner here in SG. Total I spent about $650. In Singapore iirc, it costs more than $1k for the same model.
This robot cleans well and it auto-docks after cleaning. But what I didn't like was that it's a bit forceful so when it bangs against the wall, it's loud. It also bangs into my dining chairs so they usually end up in the middle of the house. Not to mention it also bangs into the small stuff in the house. So we always have to pick the things up on the floor before running the robot. It started to get troublesome for us when my son's stuff was on the floor.
In the end we sold our robot.