Roomba j7+ vs i3+: The j-series sees obstacles, the i-series feels them

The j7+ uses a camera to identify and avoid pet poop, cords, and shoes, while the i3+ navigates by bumping into things. In practice, the i3+ will plow through a phone charger cord and get tangled, but the j7+ will see it and go around. If you have pets, kids, or leave things on the floor, the j-series is worth the upgrade — obstacle avoidance is what makes the vacuum truly autonomous.