Even after spending $US950 ($1335) on the new self-emptying Roomba, there will still be a lot of places in your home that require another vacuum to clean them. It’s a problem common to all robot vacuums — except the new Coral One. Built into this robovac is a removable hand vac that can be used to clean anywhere in your home the floor-constrained robot can’t — such as stairs or shelves.