Why do simplehuman automatic dispensers get mixed ratings?

Across the verified-purchase reviews we read, simplehuman sensor pumps cluster between 4.1 and 4.5 stars on large review counts. The volume is reassuring, but the lower averages relative to simpler manual pumps reflect recurring complaints common to motion-sensor units: charging needs, occasional sensor misfires, and higher price. They remain among the most-reviewed automatic options available.