A normal vacuum would be a million times faster and cleaner
Who cares how fast your vacuum is when it's a robots time. Unless you're paying your robot by the hour, then this is time saved. Hell you probably only vacuum your room once a week or once a fortnight, with this the idea is doing it more often, press play every couple of days or once a week and it does it's own thing then docks itself at the end to charge. At worst, you'll want to clean it every month.