A 15.75 inch all wheel drive robot rated for 0.75 acres and 80 percent slopes, with a 12Ah battery and 175 minutes of runtime. The most capable machine here, and the most expensive.

A wire free all wheel drive robot for 0.37 acres that needs no satellite antenna, rated 4.5 stars from 263 ratings. The highest rated robot mower with real review volume behind it.