LiDAR navigation vs random bump navigation: LiDAR vacuums clean systematically, random bouncers waste time

LiDAR navigation is what separates serious robot vacuums from random bouncers. Models with it — like the [Roborock S](https://www.amazon.com/s?k=Roborock+S&tag=wehavethat-20)8 Pro Ultra and Dreame L20 Ultra — map your home and clean efficiently, while models without it — like the Eufy RoboVac 15C — bump around until they’ve covered enough ground. The difference in cleaning time and battery life is dramatic.