What is the best robot vacuum under $300 for straight vacuuming?

The [Roborock Q](https://www.amazon.com/s?k=Roborock+Q&tag=wehavethat-20)5, under $300, is the best bang for your buck. It has LiDAR mapping for smart navigation, strong suction, and decent app control. It doesn’t mop, but if you just want a vacuum that works, this is it.