iRobot Roomba i1 Plus vs iRobot Roomba i7: What is the difference?

iRobot NZ (and Aus) lists both the i2 & i3 with a $400 difference. The i2 spec list highlights the same mapping capabilities as the i3 : r/roomba

iRobot Roomba Combo® j7+ Robot Vacuum and Mop, iRobot®

7 Best Roombas of 2024 - Reviewed

Overview of Roomba® i Series Anatomy and User Interface

iRobot Roomba i7+ Robot Vacuum

Roomba i1+ Updated Review IRobot

Roomba i3+ vs roomba s9: Which iRobot vacuum cleaner is best?

Roomba i7+ vs. i7 vs. e5

Roomba S9+ vs i7+ vs i3+ vs. e5 vs. 675 - Modern Castle

Can A Roomba i7 Connect To 2 Different WiFi Networks?