5 Key Differences Between High-End and Budget Roomba Navigation
Higher-end models use camera or lidar mapping to build a floor plan and clean in neat rows. Budget models still use the original bump-and-run navigation from fifteen years ago.
Mapping Roombas let you set no-go zones to keep the vacuum out of specific areas. Budget models cannot be directed at all.
The i3, i7, j7, and s9 series use smart navigation. The 600 series just goes straight, hits something, turns, and repeats.
Budget models eventually cover the whole floor but take twice as long and miss spots. Mapping models clean efficiently in less time.
If you want intelligent cleaning rather than random bumping, the mapping models are worth the extra cost. The budget approach works but is far less effective.