Look at the features involving how it avoids obstacles. Issues that cause problems are getting stuck under furniture; stuck on a wire; stuck on the sliding door tracks; stuck on a tile to carpet transition; beaching on top of a flip flop, dog toy, sock...
I think the basic vacuuming is the same across all robot machines, but high tech vacuum cleaners (dyson) with true HEPA filtering capture the tiny particles much better than those paper filter cups.
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