In 2013 iRobot introduced the Roomba 880 that ditched the bristled brushes but it still used the same old navigation and NiCad batteries that somewhat limited its potential as a truly great robotic cleaner that can clean your home efficiently.
Uses a more predictable and efficient back and forth cleaning pattern; Wifi connectivity ditches the remote control; Lithium ion battery will have a longer service life compared to the NiCad equipped; Lighthouses aren't as bulky and uses cheaper AA batteries; Has HEPA filtration
Very expensive; Did not exceed the cleaning performance of the 880 despite the upgrades