The only distinction between these two models is that the j7+ has an auto-emptying feature, while the j7 does not.
iRobot Roomba Combo j7+ vs iRobot Roomba j7+: Which is the better buy?
The Comparison between Roomba Combo J7+ and Roomba J7+ : r/BissellVac
iRobot Roomba j7/j7+ Review
The premium vacuum and mop solution like no other. It's the only 2-in-1 with a mop that lifts itself to the top of the robot, completely away from carpet preventing wet messes entirely. On hard floors, it vacuums and mops at the same time. The 4-stage cleaning system combines our edge-sweeping brush, dual multi-surface rubber brushes, power-lifting suction, and first-of-its-kind mopping.
iRobot Roomba Combo j7+ - Advanced Cleaning with Self-Emptying and Mopping
iRobot Roomba® j7 Series Robot Vacuums, iRobot®
iRobot Roomba Combo j9+ vs. Roomba Combo j7+
iRobot Roomba J7+: Avoids pet mess and more
iRobot Roomba j7+ / j7 Robot Vacuum - Unboxing & Review // I compare the j7 to the i7
Roomba j7 vs j7+: Is There Even a Difference?
iRobot Roomba i7 vs iRobot Roomba j7/j7+ Side-by-Side Vacuum Comparison
Identifies and avoids obstacles like pet waste & cords so there is less pick up needed before cleaning starts. Self-emptying with Clean Base®
Roomba® j7+ Self-Emptying Robot Vacuum