Roomba i3 comparison to lesser models

i3 cleans better
supports disposal docking
and vacuums in rows

iRobot Roomba i3 (3150) Wi-Fi Connected Robot Vacuum Vacuum - Wi-Fi Connected Mapping, Works with Alexa, Ideal for Pet Hair, Carpets Buy on Amazon

iRobot Roomba E5 (5150) Robot Vacuum - Wi-Fi Connected, Works with Alexa, Ideal for Pet Hair, Carpets, Hard, Self-Charging Robotic Vacuum, Black Buy on Amazon

iRobot Roomba 675 Robot Vacuum-Wi-Fi Connectivity, Works with Alexa, Good for Pet Hair, Carpets, Hard Floors, Self-Charging Buy on Amazon