Wall Climbing
The cleaner is built to climb walls and scrub as it moves, which is the main reason it stands apart from floor-only robots. That matters because wall contact is what turns a basic vacuum into something that can help with the grime line and not just the bottom of the pool.
For buyers, this is the feature that most directly reduces manual brushing. The practical limit is that wall climbing is useful, but not identical to full waterline coverage in every pool shape, so the fit is strongest when wall cleaning matters more than perfect edge-by-edge precision.